Re: how much do u spend
I only started to buy makeup often recently (always was interested, just never bought anything). MAC I only started late last month, but so far have bought near 500 (thank goodness for gift certificates). I've gotten most of the basics now (already owned brushes from my wedding makeup), so once I get the rest of those, it'll just be a couple things a month, at most (so far, besides Blue Storm, the collections have not impressed me).
To shorten that long post, I estimate about 45-50 a month, to replace things like eyepencils, and lipglosses (I take forever to go through an eyeshadow, so I would be amazed if I ever did).