Mostley because the new worlds that are popular, like Brachys, grow extremely slow, so the bigger it is, the more expensive it will be. And of course, sexed females will break the piggybank..Maybe I'm missing something, but why are all the old worlds so cheap in my area, but the new worlds are so expensive. I'm a U.S. resident.
Maybe not my piggy bank, but yeah, B. Hamorii is selling for 279.99. I was like "what", but you make sense.