Simple way to solve it is called ignore.

The hard way is no links to any companies or other forums that have sponsors. They all must be in Pms.This would include no links in the sig line too. Also all sponsored endorsements or reps would get a tag under their name showing they are a rep for that company. Then you know which threads are started by "reps" and you don't have to open it.

I see topics about say.....Which is better..a XTP or a GoldDolt and someone chimes in..."try a Thor or Lehigh or Barnes instead. Well that's just plain rude. The OP didn't ask about those and nearly everyone is guilty of doing it......so good luck enforcing it. If the OP asks about other option later then fine. So fair is fair or respond to what is asked by the OP.

MM for instance has no sponsors atm and some reps have a "tag" and info in the user profile. Some just lurk anon and don't post much but it helps them bring items out we want.