Are 500M Androids a success or no? Call me “maybe.”

If nothing else, Google(s goog) knows how to time an announcement. Later today, Apple(s aapl) is holding the event where it’s widely expected to announced the next iPhone — we’ll be live-blogging it here — and Google has preempted the news with an accomplishment of its own: 500 million Android devices have been activated since 2008. Andy Rubin, who oversees Google’s Android efforts, shared the data point on Tuesday evening:

The number of Android activations by itself is impressive. Sure we’d all like to see sales figures as opposed to activations, but that’s like asking Microsoft(s msft) to share sales numbers for PCs: It can’t because it doesn’t sell computers. Likewise, Google’s hardware partners capture — but generally don’t report — sales figures, so it’s simply not possible for Google to report sales. Activations, or the number of devices that are “registered” with a Google account — and therefore, purchased — are the best proxy.

Android Jelly Bean logoThe half billion Android device family is growing as well: 1.3 million Android devices are reportedly activated per day. You can extrapolate the future growth if you want, but some analysts are already doing the math. Earlier this week, IHS iSuppli forecast that Android shipments will double again in 2013, exceeding the one billion mark next year. Whether you use Android or prefer a competing platform such as iOS, Windows Phone(s msft) or BlackBerry(s rimm), it’s difficult to suggest that Android adoption is unimpressive.

But does it matter? That’s the bigger question right now because when it comes to profits, application downloads or sales of individual devices, the answers are Apple, Apple and…. Apple. Take a brief historical look at the profit picture from Asymco as just one example:

Profits of handset makers

Early on in Android’s short lifespan, it seemed to me that subsidizing a free, open-source platform to make a land grab for mobile eyeballs was a good play. One that would pay off over time. Here we are, nearly four years later and there’s little data to suggest that the investment is paying off yet. In fact, there’s more data suggesting that Apple’s methodical approach is financially sound.

Knowing full well that I’m not in the mainstream audience for technology — I’m an early adopter of such products — let me share a personal observation as someone who uses both platforms with one caveat: For the past two years, my main phone is an Android device. I have an iPhone 4S, but use my Galaxy Nexus 90 percent or more of the time. And yet: Apple has made far more money from me than Google or anyone affiliated with the Android ecosystem.

I have yet to click an ad on any Android phone or tablet via Google search or in an app. Most, but not all, of the Android apps I have installed are free. If I had to estimate the total amount spent on Android apps since I started using the platform, I’d say it’s less than $100. Some recent content purchases on Google Play probably bring that total to $150.

On my iPhone and iPad, however, that figure is likely five times higher, even though I use the devices less. Google simply isn’t making any money off of me even though I’ve owned a dozen different Android devices. Heck, even Amazon(s amzn) has earned more from me thanks to the 100+ ebooks I’ve purchased through them and many of those I’ve read on Google devices!

Again, I’m not your typical consumer, but there’s a bigger point to be made here. With Android, Google has shown me no reason to spend money. It hasn’t convinced me as a consumer to vote for Android content with my wallet. Frankly, Apple and Amazon, have. That means my dollars to go them and therefore the profits do too. So if there are others like me in the 500 million device activation pool, how and when will Google see meaningful profit from its Android investment?

To be sure, the company is making improvements with its content store, exactly what I suggested was needed back in March. The revamped and renamed Google Play store now has a wider range of digital goods: More books, magazines, music, TV shows, and movies. Since I use a Google Chromebook daily and bought a Nexus 7 tablet, I opted to use Google Play to buy two seasons of Falling Skies as opposed to purchasing them from Apple or Amazon. But that was an exception from the past few years. And if Google doesn’t continue to expand its digital offerings, I’ll likely find what I need elsewhere.

Luckily, Google still makes boatloads of money as the top search provider on traditional computers — 86 percent globally in August 2012, per — and therefore the top destination for targeted ads. That can help offset any lack of income from Android — for a time. As computer sales continue to flatten or even fall while mobile devices sales keep growing, it could become a problem, however. Android profits have to grow as consumers shift activities from PCs to tablets and smartphones.

I thought that Android would be raking money in the market at large, but it hasn’t. Heck, it hasn’t even happened in my own house and I’m an Android-centric device owner who uses a Chrome OS laptop as my main computer. If it hasn’t happened by now, I’m starting to wonder when — and how — it will.

So should Google be proud of 500 million Android activations from late 2008 to present day? Absolutely? But is Android truly successful for Google? I’m a definite maybe on that one.