First of all, Tesla was not created by Musk alone. He owns a large portion of the company, but he had co-founders with more experience in the automobile industr

First of all, Tesla was not created by Musk alone. He owns a large portion of the company, but he had co-founders with more experience in the automobile industry. Second of all, there's a reason that Tesla started with a high-end sports car and that's because bringing a sports car to market is easier than bringing an economy or mid-priced sedan. Most mass-market cars have small (or even negative) profit margins. In order to make financial sense, the development costs need to be spread over a large production run, preferably world-wide. The size of the big auto companies is so that they can take advantage of economies of scale to make a cost-competitive car. Building decent cars at a competitive price is a different market than the one Tesla is engaged in.