Part of it is just prices going down on combos because there has been more time to establish them, but most of it is that some morphs go down in price and others go up. BEL's have gone up in price a lot in that same time frame even though they come from genes that have been around for ages. I picked up a 4 gene male for ~150 several years ago but they were not highly sought after morphs at the time that made up the combo, where that combo would go for 400-500 today because they have gained popularity.