I assume (not knowing anything about the industry), is that there is a ton of capital required to enter the market. Combine that with a substantial amount of regulation and it is a difficult market to get into. Besides, even if you did join, you are better off selling at the "monopoly" price even if you don't sell all of your product.
Well of course you sell at the monopoly price, thats why you entered the market in the first place. I would not think the capital would be particularly outsized compared to similar venture.
You'd sell more, until the competition lowered their prices to compete. At that point, everyone in the industry (including yourself) would be making less profits. Great for consumers, bad for your business.