I don't care about valuable or rare. Blue flames looks better in any case. Sure, we can get sick of it, but I really just like the look better in general.
I think they go good with different colors
like, if the orange flames look bad with a certain color scheme, I switch back to default
same thing with visor colors, I often switch between blue, silver, and default
currently anything that I would use the black with, I use silver, because the other two don't look good