Home. People spend weeks to save $20 on an iPhone but overpay $50k on a home without blinking.
Car. My car cost me 3k. I had 50k on my account when I bought it. Most people would use the 50k for a downpayment.
Eating out. SO much more expensive than cooking your own meals. You can easily throw $300–$500 out if you eat out a lot.
Gadgets. When iX is out, are you sure iX-1 won’t do the trick, for $300 less?
Utilities. Water and electricity are expensive and people spend WAY more than necessary.
Clothes. I dress exceptionally well. However, the most expensive shirt I’ve ever used cost $40. Great clothing doesn’t have to be expensive.