>>Realistically, if you have maybe 1500 of the most popular apps, you have enough to pretty well serve the market.
Yes, that's the point. It's just that iPad now has so many good quality apps compared to Android. It _may_ change in future, but for the time being iPad wins. (The total number of apps never matters, most of them are crap anyway)
Yes, everyone will have a different set of apps they use, but there's no realistic justification that "SearchEngines.ru Forum" (from the recent release page I just looked at) is adding much value to the platform. A lot of those 65,000 are apps like those. Realistically, if you have maybe 1500 of the most popular apps, you have enough to pretty well serve the market.