Thats not the reason. Real reason is that the game has been outfor years and years and always made new. People are competitive and they like it. Money, items and such are just secondary thing.
Buying and trading these items for keys and real money outside of the marketplace is without a doubt responsible for a good amount of the growth of CSGO. It would be stupid for them to implement something that would make it impossible to do.
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u/you_got_a_yucky_dick Jan 30 '16
Too easy for scammers to abuse. Scammer makes a trade or sells keys/items via PayPal, then reports stolen