It is better to do manual trading, rolling money will be tricky sometimes and if somebody just depend in a bot then also it can be initiated putting some script to the bot to trade unwisely. I mean how can you say that the program you want to run is secure and can't be programmatically hacked? Furthermore, trading automatically,  you have to pay the service as what OP says, so less hassle but questionable when it comes to security. However, it depends on trust. But be sure to make money roll up not down. Good luck to your project.