This website would have some worth if it weren't overrun with scam artists trying to charge 50% markups on coins they sell.
Unfortunately *everyone* i have sent there to buy coins has been met with absurd prices.
If I owned that site, I would require everyone to sell BTC for market prices, or close to it.
That is, if the site owner wants his site to actually stay alive.
Get your math straight. At the current rate of $1200/BTC, how many transactions on there do you see that are $1800/BTC? Some are slightly marked up, some are BELOW mtgox price. Do you think exchanges are free too? There is a fee to wire money in, a fee to trade the coin, and a fee with withdraw. Not only are there fees, verification and deposit/withdraws takes weeks if not months. The localbitcoin website is free if you don't use escrow, and only 1% to one person with the escrow service.
Almost every transaction on localbitcoins.com is legit because there automatic escrow. Just don't use the risky forms of payment like paypal. You want to see scam artist? Look at BTC-e and coinbase.