Huh? All MorphMarket is is a better organized, easier to navigate, classified site. Fauna and KS are classified sites as well. If you've been looking at Fauna and KS for years, you should be familiar with the ups and downs of BP pricing. MorphMarket has nothing to do with that...
Side note: the Rainbow gene is one of the newest and hottest genes out there. Your impression of the market using that as your baseline is similar to looking at Silicon Valley and thinking that's how the rest of the country lives.