for a year of trade I blocked about 300 scammers. "It is capitalism - baby!"

I hope that I am mistaken, but all this is similar to lobbying of interests of owners of Steam. Keys are bought in big quantity it is favorable....

Excuse for a new subject - I promise is there will be the last subject concerning an increase in prices, but you didn't allow me to answer

Backpack.tf of course not the reason of price increase. Exactly referring to the prices of speculators on the site http://www .tf2outpost.com/the prices of Backpack.tf rise.
if not to interfere with this speculative process when keys are on sale obviously more expensively established price, it is process itself won't stop, though keys in game now much. It is artificially caused deficiency. Because of growth of cost of keys all players try to hold them at themselves as much as possible. It causes new demand for keys and so on. The reason - speculators on the site http://www .tf2outpost.com/

by the way, it is necessary to forbid and buy still keys more expensively than face value.

Speculators dictate the prices of TF2 keys. It is the only reason (IMHO) which forces keys to be more expensive. I suggest to forbid to sell keys more expensively than the cost specified http://backpack.tf/.