Interesting thread, I really only buy what I need (Food, clothes etc). I am extremely tight when it comes to money, which is a trait I got from my mum. For example car parking, I would prefer to park 1-2 miles out of the city centre just to save on the parking charge (which can be anywhere from £2-£6 per time, depending on how long I stay).
I would much prefer money in my bank account then, spent on ornaments, junk and other useless things, I'm very much functional over anything else. If its not going to be useful in my life its simple I just wont buy it.
On the other hand my partner is the complete opposite, she would buy ornaments, overpriced gifts from a tourist gift shop, dog clothes, blankets, she even leaves the light on all day when I'm at work and I think what a waste of money!