Community members that spam posts in this way are in violation of our posting rules. It's important to keep in mind that small businesses, dealers, and stores are allowed to post on OfferUp, but we ask for them to not spam post in the way you are describing.
If you have reported the users that are violating these terms, our Customer Care team will review the report and take any appropriate action.
Do you think having a specific section for businesses would help solve this problem?
It's worse here in Southern Cali...the car capitol. Blocking the IP addresses will solve nothing, as they can easily find another access point to post ads, nor will banning accounts (as it is too easy to name another one). Initiating MAC address bans would hurt their pockets.
Having a speific section for businesse/dealers will not effective. Dealers are fully aware that there is more exposure on the private/owner section...as proof...look on CL.