I periodically complain about sellers posting ads of cars without license plates and one troll suggested that it is suspicious that I am "always" buying cars. The rest of the time they either respond "Only another flipper would complain about that!" or "You idiot, you are supposed to remove your plates when you sell your car!
When you sell, yes. When you sign over the title and receive money. Not when you post for sale.
How am I supposed to test-drive that?!