I'm not that upset about affiliate links in a signature - I would rather they not be there, but it isn't a huge issue to me. I do agree however, that these posts that say "I will answer your question, but only if you join my site" could be damaging. That means that anyone who does a search later will not be able to find the answer on Unity. I think people have the right to start their own forums, but this is using Boonex and Unity as a vehicle for their marketing, and it is tacky at see more best.