I personally hate that idea. Yes I have thought of doing it in the past, but sometimes, when I try to go to a concert and the tickets are sold out and I try to find one, it's a 100% markup or more. I hate that!!
There are some people that want to own a PS3 at launch (who knows why) and yes they will pay a high price, but why do people have to take such advantage of them. I am a firm believer in what goes around comes around. If you have enough money to buy three PS3's good for you, some people only have enough to buy 1 with no games, so you are screwing them over.
The thought of selling a PS3 for a much higher price did cross my mind, but I won't do it. I just think it's wrong to do so, so I won't be taking a part in it. The thought of owning every launch game for the Wii, plus all controllers made off of my PS3 profit does sound real tempting, but I think it's just wrong.