Bots don't interact with your feed like real people do, so my advice would be not to buy any as you will simply be wasting money. I've seen accounts with 20k+ followers get less than 1 retweet per week, I've no idea who they think they are fooling apart from themselves. It takes time to build up followers, but the benefits (income/exposure) far outweigh having a fake high follower count simply to look cool or massage ones ego.
