This whole belief that to participate in HFT you need to (1) have tens of thousands of dollars per month to get co-located, and (2) a supercomputer is so far off it actually IS funny.
(1) I know of a firm that offers co-location (or at least sits at a facility near the NYSE/NASDAQ with a direct data pipe to the exchange) for $200 per month.
(2) As mentioned by other (smarter) members, you don't need a supercomputer to do this. In fact, a $300 Playstation 3 (I'm not kidding) has MORE than enough power to HFT quite a few stocks.
So, $200/month for co-loation, $300 one-time cost for a PS3, and monthly data fees (which many already pay at their home anyway). All that is required to successfully run a HFT strategy is intelligence, hard work, and skill.
Whiners need not apply.