Selling CSGO Keys hep

Well, I know some people who buy and sell CSGO skins for profit and it's not uncommon for them to have hundreds of keys from making a few here and there. Say they want to take some of that key value and buy a shiny new game to play, well then they would need to convert to wallet to buy the game. Before the lock of cross-region trading, what they would most likely do is trade those keys to a person in the RU/CIS region (which is usually half the price of US/Canada/etc) and then that trader would sell the keys for the money to buy the game.

Also when it comes to CSGO trading, occasionally people will quicksell their skins on the market. If you find a knife or something on the market that's significantly under its going rate, you'd need wallet to buy it up and keys would do you no good.

generally they use them as a currency. As you cannot trade let's say Gift copy for wallet funds, buyer pay in CS:GO keys, and then seller may use them to buy other games or sell them at market to receive wallet funds.

all examples you need:
http://www.steamgifts.com/trades/search?have=keys

uhm imagine I have a game that you want, but you don't have any game\item I like, so you pay with N keys (based on my game value). I'll sell the keys or I'll use them for another trade, that's all.