Best Trading Strategy Why Traders Sell Signals Instead Of Trading Their Strategy Solely?

Why traders sell signals instead of trading their strategy solely? - best trading strategy

There are many sites where vendors sell their business decisions - the so-called "signs" ... Some of them are very good, but most are false. I wonder why these people who currently own a business strategy that the signals profitably sell to someone else? Is this an attempt to influence the marketing strategy that works best for the owner? Is this a step in the right faith? Greed?