I was just sitting at home one day and stared at my Nail Polish collection. I have almost every colour out there (not considering the different shades of each) then it dawned on me, how much did I spend on them? I own a lot of Sally Hansen and OPI, at least 50 different nail polishes and some of them were gifts and some I threw out a long time ago. How much have I spent on Nail Polish over the years? If I do some mental math, the number that I come up with is about $150 - $175. That's quite a lot and I don't use them on a daily basis. I wouldn't consider it a waste of money, but then again I wouldn't consider it as a smart investment either. What do you estimate is the cost of your collection? Investment or waste?