Team Fortress 2 Key price in the Mann Co. Store is usually higher, than in Community Market. This makes people buy keys in the Market, so the total amount of keys is not increasing, it's going down because people are using them to open crates. Moreover, there's a lot of people who buy keys for metal and then resell them for a higher price. Because of all of this cases the price of a key in metal is constantly increasing. A lot of people want to leave TF2 because of that.

The only way to stop that inflation and restore the economy is to remove Keys from the Steam Community Market. People will buy them only from the Mann Co. store, total amount of keys will increase and the price of them will go down to the normal state.