I cannot say whether that is legit or not. I would not pay more than $50 in advance of arriving. That location is very convenient for hockey and medal ceremonies (downtown). Pretty good for curling (Main @ 30th). Not too bad for figure skating and short-track speed-skating (Renfrew @ Hastings), but you could do better. I'd say it is a poor choice for long-track speed-skating (Richmond), very poor for free-style alpine events (West Vancouver) and unacceptable for other mountain events (Whistler). I think that covers the events and locations - others will correct me.
There are very few event tickets left, and it is just stuff like preliminary rounds of curling. Canadian residents had first dibs, and bought up most of what was available in October. There was a second round in December. Right now, you cannot get tickets at all, but some will go on sale in the middle of the year. Visit http://vancouver2010.com
, where I think you can get on a mailing list.
There are ticket brokers selling seats, but they may have come from seats allocated to International Olympic Committee members and event sponsors. If the organisers find out the tickets are from those sources, they will cancel the tickets. IOC and sponsors get about 1/3 of the seats, I believe.
On the other hand, you can't go wrong with an Escape!