Bumping?

I'm a bit confused as to the rules, I recently (after eight days) "bumped" a marketplace thread asking if my price was too high and received a warning. Fair enough, rules are rules.

Yet when I go take a look at the market place forum there are recent threads where the first four posts come from the same user, and there are countless other threads on the front page along where people are saying things like "still available," or "price now" that could have been done as an edit and there's no moderator action.

How is this not bumping? Or should I simply consider getting my title changed so I can enjoy the same privileges (although to be fair there are regular users doing the same and getting away with it).

Frankly, I may be a bit peeved here, and I hope this doesn't involve me getting another warning but I don't understand this. I've been a member of this site for a long time, I've contributed a lot, and within five minutes of me posting on my own thread (after eight days no less) I get a warning and a moderator telling me I'm bumping. And my reply was at least several fold longer then "still available," replies and not small talk designed to bump my thread.

Could somebody explain to me why I'm being penalized for my post? Because it feels like I'm being discriminated against for no good reason while other people are blatantly bumping with no moderator action.