I'm not sure how you believe that marketing 500 snakes at $1000 each is somehow going to make a breeder more money than 10 snakes at $50K each?
To make that 500 snakes, a breeder has to have several females(fed and housed and heated year-round) and several males(fed and housed and heated year-round). Then he's got to advertise and market and network to find 500 people willing to buy his particular morph. In the meantime, he's got to house, feed and heat all 500 babies he's got for sale.
To compare...
500 snakes at $1K each = 50 females(10 perfect eggs each) and at LEAST 5 males(breeding 10 females each) and added time to house/market all 500 babies.
10 snakes at $50K = 1 female(10 perfect eggs) and 1 male and the time to house and market 10 much-more-rare babies.
I know which method I'd prefer to use to net myself $500K. Granted, he'd have a ton of females that would continue to breed... but once you've hit a certain saturation, all your customers are producing and you have to work even HARDER to market your babies among all the other people with them, and you're stuck with 55 snakes who's genetics will not suddenly change to be some new morph. It doesn't continue to go up. It starts slipping downhil rapidly, which is why many breeders immediately begin making combos now.