[danmaz74]

From what you write, it looks like you equate marketing with advertising (unless it's your marketing theories that include advertising as the only path to success). That's not the case - advertising is one of the tools of marketing, not the only one. If you're interested in expanding your horizons, one interesting read is Frank Lane's "Killer Brands" - the start of the book is a little too boombastic for my tastes, but the content is very good.

[speeder]

I also include in marketing generating word of mouth, good site, store SEO, and so on.

But it is needed anyway, apps ( specially on iOS ) do not get traction anymore by pure organic growth alone.

For example: Apple removed the new app list from iTunes, and the search take in account popularity, so a new launched app has zero visibility.