Maybe it's just me, but from my experience using these bots, they hardly ever payout more than what you put in. I guess I never invested enough to make it to the trending page either.
I can see why people have problems with them, especially when some of them are a bit... 'shady', but is it really the people's fault for using a service that's available? I feel the service itself should be targeted.
RE: Random selection of vote purchases