Makeup is a significant hobby for some folks,hobbies cost money. Don't be embarrassed =)
I'm only at about $500 for silk naturals, but I only really started ordering SN late last year, lol. My makeup $$ before that went to other stores, and I am still a bit of a makeup whore, so there are plenty of other places taking my money.
I decided a while ago (when I realised there are about one hundred mineral eyeshadows in my 'currently using' pile, and bags and bags that didn't work for me) that collecting mineral makeup is my hobby, it's not that expensive as far as hobbies go, and it makes me happy
As long as you aren't spending the mortgage money or sending the kids to school without brekkie so you can get your fix then why not enjoy
At least, that's what I am telling myself