It's basically what someone is willing to pay. It's like everything else, if it doesn't sell at such a high price, eventually the price will come down. Unfortunately, there is always someone who will pay the high price, for one reason or another. Too bad there wasn't a lot of grafting being done so the varieties will become more available at a reasonable price. I have several grafted mango, peach, plum, avocado, persimmon etc..... that I very rarely paid over $35 for 3 gallon trees, again they were not sold until there was a reasonable supply.