It hasn't really, I've always been a bargain hunter and only splurge (ie. pay full price for something) during Christmas and my birthday. There are certain things I don't skimp on, my general rule of thumb is to spend less on things that are going to get washed away, ie. facial cleanser, shampoo, etc. and more on things like a good moisturizer with spf, foundation, conditioners/treatments, but even then I've found brands that aren't too pricey and go further in the long term, so I've stuck with them for years.
Perfumes, on the other hand though, are another story. I'm still trying to get a grip on my eBay/late night, "But it's a SUCH a GREAT deal!!" disease.