When people who are selling these animals don't operate like a business and compete on price alone as the only factor of them making a sale, undercutting is going to keep happening and prices will go lower and lower.
Its amazing to me that people are in this for such short-term return that they'd rather sell a pastel for $250 immediately as a hatchling, as opposed to raising it up to 300-400 grams and watch it fly out of your rack for $400........