From a report published by the unofficial Steam’s communicating website SteamDB. Valve made over $1mn (at least) in January from cheaters solely.
SteamDB, an independent investigator of Steam, recently graphed down the number of accounts which were handed VAC last month. From which it is comfortably witnessing and convincing that more than $151,000 accounts were banned in the First month of the new years and if we do the math gently. If an account was sold for an average of $8 or more considering discounts and bundles, Steam made over $1.2 millions just by making all of those banned accounts obsolete.
Accounting to the increased in number of hackers in couple of months. Valve has not been stringent in terms of eliminating hackers from the game by making VAC more secure and rolling updates to it. The amount of money made by just banning these accounts and not leaving them with any worth are far stronger than they appear, To be noted effectively, the game being referred to is mainly Counter Strike: Global Offensive. So, in terms of different games and accounts being banned by VAC as a whole. All those money invested in it or by making their inventory of no use makes Valve richer with each ban.