[DenisM]

There is limited amount of things which people look at for 1 second and say "oh, I get it". Most of these things are likely already represented. Things that require 5 seconds until the "I get it" moment will require some incentive to spend those 5 seconds - either sky-high ratings, friends advising, known brand etc.

[ashu]

True. Until somebody comes up with something and you go "Doh, how come I did not think of that?!" or "Man, that was just genius..."

[Tichy]

Yes, but the talk here was about a crosswords application, not a strike of genius.

[bootload]

"... There is limited amount of things which people look at for 1 second and say 'oh, I get it' ..."

You are not taking into account new technology and the way it disrupts the market. The technology leaps come in spurts so it is more a case of waiting for the next wave, iterating while you do so.