Businesses tend to take action when they feel people are abusing their services. Sucks eBay did that to you when there are plenty of real scammers on there.eBay kinda does something similar. when I received my superslim ps3, which seemed to have a defect (found out later that it was related to sony actually), they put me on a list for trying to return the item. however, the guy said I could keep the system, and he would refund my money, which he did. anyway, I'm no longer on this list, and it would remind me of this every time I tried to return something for about a year or so. I have no idea how that even happened, but it made me angry.
There's a lot of questionable reviews so who knows.My account also got banned from posting reviews too. I don't know why, I haven't violated any guidelines.
I particularly don't trust Vine reviewers as those can be biased and they're invited so there's an incentive for them to do a good review.