If you are talking about the tf2 man.co store yes that would be a good idea to aim at getting items but I imagine it would be very hard to hack.
If you are talking about generating unusuals and stuff like that then you would actually have to get into the item servers which would be extremely hard.
Really though the amount of effort and risk of getting caught (legal punishment) is too high for just getting items in a video game. Better off hacking something easier, getting money from there and just buying whatever you want from traders.