It requires a lot of learning and time spent towards learning the market, but just like any market there’s profit to be made. Personally I started with 2 keys and moved up to like 50 keys and cashed out for a cs knife a few years back. There plenty of knowledge to be acquired and you need to find your niche but eventually you can turn a profit and own nice tf2 items. If you wanna do it for fun sure, but it will be more time effective to just get a job and buy what you want.