Are you selling game trainers? If so, why not just include a time-gate in your source code, able to be mitigated by a micro transaction?
I'm sure there are tons of script-kiddies that would love to try before buying, assuming the cheats are worthwhile.
Also, what can be achieved with your cheats that someone with a copy of CheatEngine, Winsock Packet Editor, and / or OllyDbg (perhaps not so much Olly, as it requires at least a basic understanding of ASM, which your typical script-kiddie would likely lack), couldn't accomplish?