I think that you do have a point, but this is something that every forum or social media platform deals with everyday. I like this platform, in fact it is a concept that I was hoping to find for a long time. I am a newbie, literally joined two days ago, and even I have seen what you are talking about on a few of the posts that I have read.
It is something that could be regulated, but will not be eradicated completely, no matter how sophisticated the "search bot" would be to search for these posts and delete them.
This is a platform that pays people to express their opinions, and I have just learned that these posts are worth even more, so you are going to see an uptake of people coming on-board to be paid for their posts, and they may not be able to see the uniqueness of this platform or appreciate it as much as you "oldies".
I say, just ignore the more blatant ones, and encourage people like me who want to participate and see the money factor as a side benefit!
No need to "regulate" it like that. People's voting behavior would regulate it. It's a free market solution, so to speak.