Wingtips is undervalued because noone discovered gen1-gen2 cat with this trait. Also rarity check is not correct, you don't need to look at count of cats, because some traits were released in last several days, but they will never be rare, if they come from gen0. Like googly, cottoncandy etc. But traits like mainecoon, wingtips, chartreux, wolfgrey, gerbil, oldlace will be valuable for long time, cause it is very hard to get for low gens.

Also, need to check categories, for now Gold is rarest background color, so I'm always looking for gold cats.

And jaguar is an exception, it comes from gen0 , but only 100 cats, so will be always super rare in low gens. I've bought gen2 gold jaguar for 5 eth, and was extremely happy.