I guess I'm the breadwinner... never thought of myself as that. After I got married, the sister-in-law moved in. It's the 3 of us. Yay. I pay all the bills, my wife buys the food and other household expenses. I'll fight for the restaurant bill. Sister-in-law pays nothing. Yes, I'm a little bitter... especially since she says she'll never move out.
Anyway... I'm an expensive shopper. I don't shop much, but when I do it's for high priced items. Suits, shoes, coats... that sort of thing. She shops more than I do, but buys the cheaper purses, scarves... good thing she can't buy shoes cause she's a size 5.
I don't have to discuss with her my big purchases... but I do anyway.
I find it gives me perspective into my purchases that I otherwise wouldn't have thought about.
(I like buying really expensive things, all the time. :P) -- She's definitely more frugal and save for the end style... so it helps out my budget a lot. And yeah, I would be bitter about the sister-in-law thing as well.