This kind of is a weird post from me, since I already left once...
BUT!

I don't think you should leave for screwing up yourself...
Yes, it s*cks what happened, but you can do that at almost every website I know..

At Cex, I can buy GHS more expensive than market order, same for Cryptsy, TheRockTrading and any other website where users can sell anything themselves!

For instance, you want to buy a car, but you have to much money, so you buy the 5000 dollar one instead of the 2000 dollar one, while they have the same specs.
IT HAPPENS!

I REALLY think it's your own fault for screwing up.

Next time, check what says.

Also a tip: you can click on the highest bid / ask on the list and it automatically fills that in on the sell/buy form.
Scroll back to the top to click on your amount of BTC / LTC and it automatically gives market order pricings for you ^^