I don't see why people have a problem with this. It's a tangible good, sold at prices determined by the market. A PS3 is a luxury, so it isn't price gouging. Sony is getting what it wants, the store is getting what it wants, and the people who buy the overpriced PS3 on eBay are getting what they want.
If you hire someone else to do wait in line for a PS3 it's a job. They trade their time in exchange for money. It's not a new concept.
Arbitrage involves risk, and these PS3 speculators are assuming that risk. If the PS3 is a massive flop, then they lose that $600 and the worth of all that time they spent to get the PS3. If the businessmen can't resell the PS3, the homeless man they hired still gets paid.