no there isn't. come back in five years, the top ten internet companies will control 95% of all traffic and 99% of all revenues. this market has almost zero friction...how is it that google has already sewn up over 80% of ad revenues on the web? where are all the mom-and-pop ad networks? they're on deaths door
by the same token anyone can build a PC...so what happened to the 10,000 little PC makers that used to be in every strip mall? today we have basically three pc makers....hp, dell, apple. so much for "low barrier to entry = high res"