[NikolaNovak]

We've just gone a lovely circle :)

The "barrier to build ", as used by the initial post and in this context, is "barrier to put something in front of eyes of the customer".

With that barrier being low, it's supremely hard for customers to pick wheat from the chaff. Who's gonna bother going through 3 million offerings and figure out what's useful?

[mrtksn]

I guess the discovery will be similar to discovery of viral tweets and YouTube videos. That is algorithmically and virally.