Because they 1) paid $1000 for the morph due to supply at the time of purchase, and 2) because they're driving up supply themselves (1-to-5 ratio at 3yrs, 1-to-10 at 4yrs, 1-to-15 at 5yrs and 1-to-45 at 6yrs when offspring become breeders).
Simply put, when there are 45 offspring in circulation for every one purchased on a six year roll, you simply can't continue to sell the offspring at 100% the price of the original stock.