In fact, i used to buy preconfigured bots a long time ago, they all were a waste of money and time for me, i could never get them to work.
Bots do work if you configure them correctly. I've been using Gunbot for quite some time with some custom settings I've been testing for several months and I'm making a profit on most days with it, though I'm still working out some kinks daily and changing settings as necessary. Nobody's going to give you a (good) profitable strategy for free, because if that strategy was so good, why would anyone give the strategy away for free or for a low price?
I will definitely say that they're not for everbody, though. Even if you're already a good trader, it does take some time to figure out how to use and configure the bot you're using properly, and there's no guarantee you're going to make money with 'em.