I have noticed that the price for mutants, dyed pets and achromatics has steadily been going down, but the rest of high color pets have pretty much stayed the same. I think that is quite a bit in part to Kir.
What I think would be fun is an event where he asks for those kinds of pets in exchange for a different point system with new pets and items that you can get as prizes. But rather than Kir saying 'I need an achromatic Narwi' or somthing to that effect, it could be more like the halloween army event where you can hand in what achromatics, mutants or dyed pets you want for different amounts of points by rarity. For example handing in an achromatic ebilia would be more points than an achro ardur, which in turn would be worth more than an achromatic otachie. This may hep stabilize the economy. Maybe some of the non retired CS pets could be tossed in the mix to give to Kir too.
I just had this idea a while ago and thought now might me a good time to put it into words :)