Not all sponsors do it, but don't you have a market place for inventors and sponsors? Why are some sponsors allowed to post blatant advertisements on the main forums? I reported one, but it has happened many other times (and if it would have been disallowed the first time, it wouldn't still be happening).

Please keep the spam off the boards, regardless of whether some people pay you for a banner (or the right to offer things in the marketplace forums).

It's... really... really... really... annoying.