Due to an update of the marketplace rules it is now forbidden to excessively bump your classifieds. Once a week minimum from now on and only if the price is lowered. These new rules will be strictly enforced and any members found in breach of these rules will see their classified deleted.
Here's a copy of the rules:
It is advisable for all buyers/sellers should read these to know where you stand in regards to buying/selling in the DB marketplace.