By Chris Rosvoglou Baker Mayfield’s days with the Cleveland Browns appear to be numbered, but his trade market hasn’t been active as some fans thought it would. NFL Network’s Ian Rapoport recently said Mayfield’s trade market isn’t very strong is because of his $18 million base salary “It doesn’t seem like anyone is interested at this salary,” Rapoport said. “The at this salary part is key because Baker Mayfield is unlikely to be traded at $18 million. If the Browns are able to eat some money, or the agent and new team can come up with an answer to split or deal with his salary, I believe he’l…