On buying a bot: simply don't if the source code is not open and free to change and use. And only buy to see the code
Who wants to sell a bot?
- An exchange that wants liquidity. And also it will earn money via fees.
- A bot developer who thinks the bot can only earn money by selling the bot!!! I mean if your bot really earns money, why would you sell it? You just keep your exponential winnings to yourself.
- An exchange player who wants the market to behave in a certain way.
I dont see a winning scenerio in buying a bot in long term if your only intention is to use bots written by others.