It's tough to say that for sure hentai. It often becomes a chicken vs egg argument (the old argument of which came first, no sexual joke intended).
The question becomes do guys save their money to spend it on sex? Or do they spend their money on sex because they don't have a great many other options?
In any case this IS a business, so expecting them to have anything other then money as a primary motivator is perhaps counter productive. I believe getting people to spend money in the ways you want to see the game developed is the route mostly likely to yield results.