-we've got "pure bitcoin-based" multi-million dollar businesses (silkroad, satoshiDICE, mtGox,...)
Ah, yes, the multi-million dollar businesses: a black market and a casino. Yeah, that historically always went well. No really, it did, except for those that got their brains bashed in or got sunk in the Hudson or gunned down in the street. But: there's always new blood to take up the slack.