Tesla investor Ross Gerber says he's been dumping the stock because no one wants the company's cars or robots

Tesla investor Ross Gerber says he's been dumping the stock because no one wants the company's cars or robots

The used car market is now swarmed with old Teslas, longtime shareholder Ross Gerber said.Emma McIntyre / Staff/Getty ImagesTesla stock is in a "quagmire," longtime investor Ross Gerber said.He said he sold around $60 million in Tesla shares amid growing concerns over the carmaker.No one seems interested in buying Tesla's cars anymore, Gerber told Yahoo Finance.One of Tesla's longtime investors has dumped around half his stake in Elon Musk's car…