"100% profit is impossible. If the price is double it is 50% profit."
Here in Texas, anyway, the math is that a buy at $200 and a sell at $400 is a 100% profit. A sell at $800 is a 200% profit. A sell at $300 is a 50% profit.
The problem....as with all of the USA, is that making a living is no longer fashionable. The gun dealer can't live in a 1300 sq ft house and drive a 9 year old 1/2 ton truck and wear a pair of shoes until they wear out.
Like the owner of a Pizza Hut or the guy who picks up your garbage, the gun dealer must drive a 2008 Tahoe XXT Edition. He must live in a new 4000 sq ft house and he must have a pair of shoes for each day of the week. He must eat at Chili's four times a week. If he did not screw the seller of guns and the buyer of guns he would only have a DVD player, not an HDTV player.
