I'd keep it as a hobby(don't quit you day job), until you get lots of Wins under your belt. If your really thinking of doing a motor company, I'd look at China and also doing Brushless. If you could bring down the price of a good brushless($100-$150 with controller) you'd have a Great market. Most all the Japanese motor companys have contracts with someone already, so getting them to outfit you maybe hard, but I really Don't know anything about this.
Good Luck!!! But have FUN!!!
Bradley J. Gotori