A lot of people are careful to hold onto their receipts in case they decide to return or exchange an item. But once you have your impulse shopping under control, you still need to retain your receipts in case an item breaks while under warranty and needs to be repaired or replaced. Yesterday our toaster gave up the ghost - despite being set for a light golden brown finish, the second slice of toast came out blackened. And when DW tried a third time, flames shot out of the toaster before it shorted out. Luckily I keep all the receipts for our electrical items with the user manuals in one drawer in the kitchen, so it was easy to take the loaster back to the store we bought it from last November. I got a credit note for the full purchase price and used this (plus an extra 75c) to buy a brand new toaster with a two year warranty. If all our future toasters decide to self-destruct while they're still covered by the warranty we may never have to pay for another toaster ever again.
There's nothing worse than having something break that you know is still covered by the warranty, but not being able to find the store receipt.