Make-up for me is a huge hobby.
I do wear it semi-regularly, but I find the most joy in just playing around with it and helping other people with their make up.
I go for neutral looks but play around with a LOT of brights, especially when I'm doing fun things like halloween or cosplay.
I've dabbled in SFX make-up (two vampires, a geisha, a pirate, and two zombies) but I am by no means a "beauty guru."
Anyway, my point is that I buy make-up like every time I go out.
Literally.
I almost constantly have swatches on my arm and, trust me, I get teased for it. The way I deal with these smug girls (and even the guys who are like "oh, you don't need make up" is that I simply say "I know, it's a hobby. I just love messing around with it." If they argue, I just kinda shrug and leave it at that. Usually they don't, though. We all have our own passions, y'know?