What you do with the rewards doesn't matter much when you receive them in an abusive way towards curation as a whole to begin with. One could also argue why your community should deserve more rewards than anyone else running theirs. Someone with your stake may not be able to reward their community with their votes as much as you do with bought votes. In many ways you're doubling down on the amount of rewards you take from others curating the regular way because you get votes from bought services then offer votes from bought services with the profits.
I can't stress enough that it's one rewards pool and ecosystem, if you make higher returns from a scheme, the scheme makes higher returns from you then you are quite literally taking rewards from others not participating in this. And "this" is growing and the more it grows the worse curation is off and the faster abusers grow compared to those using curation the way it is meant to be used. I'll try simulate this in a post in the future, it's probably a lot of math and may not help make things clearer but I'll give it a go so people can see the longterm effects and exponential pull this has on inflation.