I'm not being funny or anything, but...
People who are just sticking free adverts in stick out a mile anyway, and fair enough, they should be removed because they should be paying Danny for the ads. But, if it's a genuine discussion as to which supplier is the most effective, then it's not like it's taking food out of anybody's mouth or anything.
Wannabes is full of discussions about flight schools - and they're commercial organisations too. The no advert rule is fair enough, but I don't think that particular thread could have been called an 'advert' any more than any other thread on Wannabes.