I've been accused more than once of working for eBay - I don't (unless a person consider working on my own business 7 days a week to try and make a living and eBay earning hundreds of dollars in commission every month to be "working for eBay", but if they do, then I also work for other (competitor) sites), but, point is, if someone is going to believe that I work for eBay, then I doubt there is anything I can do or say that will change their minds, since by and large they decide that's somehow the truth based purely on the fact that I have an opinion which differs from theirs and is interpreted as defending or promoting eBay ("perfect" evidence if ever there was any*, but I digress...).
I believe I have been very vocal in my criticism of ebay here on the boards on much more than one occasion, and don't notice any affect on my sales (perhaps that is evidence I work for eBay 
). True enough I don't use my store account to post here, but the accounts are linked so it's not like eBay couldn't track me down and switch off my lights if they really wanted to punish me for consistently saying their CS reps barely know what they're talking about, or for still being ticked off about the FVF on postage, how the cart "works", their general treatment of sellers, lack of site functionality in many areas.... The list goes on.
There is this thing called confirmation bias, though, where people (generally subconsciously) look for information that confirms what they already think, or simply interpret it that way. Sometimes people get a notion stuck in their head, perceive a correlation and automatically assume that equals causation, but it's misleading to presume so. I used to think all sorts of things affected whether or not I would get views or sales (everything from answering surveys to paying my bill), but while I do know there are very real seller limitations and "lights on / lights off" things happening, eBay have a long history of automating as much of the site as possible.
I'm willing to bet that eBay is far too stingy to bother reading or screening the forums to look for criticism and then single out the seller to punish them for it. That would require hiring and paying someone in an active role, and considering they don't even bother to do that with much more important roles (eg site integrity and safety, request reviews on the basic level), I highly doubt they would invest that money for forum trolling instead.
*cue people who suddenly think that's my job*
Could be wrong, of course - I have been before, plenty of times, and eBay aren't exactly well known for their logical decisions.
*t'was sarcasm, in case that wasn't evident
