- Why do they sell these bots? Will not it be easier for bot owners to use themselves instead of selling?
Because their bots can't guarantee they will make profits. Trading bots are just a bot, they can make mistake because all of them depends on technical analysis which sometimes sucks. Selling these bots would be more profitable because they can get at least somewhat better income from users.
- Do the owners of these bots use their bots?
No one really knows. I tend to believe they don't use it or rarely use it.