I'm sorry you feel you are being singled out, but you are not. The TOS states "Posting of commercial images/links is limited to active vendors and products in the Renderosity Marketplace.", this includes links. I'm unsure how much clearer the TOS can be for you. Linking to "stores" may only be done by Renderosity vendors. Linking to other marketplaces are not allowed. Please think of it this way, would you go into a store and tape a flyer for another store on its door? In most cases no one would.
In his partial defense (though I'm guessing he's guilty of off-site MP linking), the parts I'm seeing quoted by you and everyone else in this thread is very vague and unclear, and up until your post that I'm quoting that you could only post links to products if you are a vendor-- while being a non-vendor and posting a link to your favorite rendo product or merchant would be against the rules-- which the ToU itself doesn't so much as hint at. 

If those gallery rules apply to all parts of this site, then the ToU really should be changed to reflect that, IMO.  Meh, I'm actually rather used to posting on message baords with unwritten rules, but none of those are commercial sites-- the latter are much more professional and shouldn't allow unwritten or poorly written rules to creep up.

If English isn't the TC's first language, I can easily see how he would have difficulty understanding that rule about off-site MP linking, because that part is written in a way that it would be very difficult to translate either in one's head or via language software.