It's an automatic reaction to dissect receipts for more big-ticket items or when our shopping trips are limited to a few items. When we make serious grocery store runs, involving dozens of items, it might seem like more of a hassle to scan through the receipt for errors, and besides we watch every item as it properly scans, right?
Checking the receipt on the spot may be out of the question with the next person in line breathing down your neck, and once you leave the store it's difficult to prove that you've been charged for two of an item when you only walked out with one.
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Now that online banking allows us to easily track every purchase we make with our debit cards, cashiers at some places like coffee shops ask whether or not we want our receipt when we've made a debit purchase. There are some people who only use debit cards to simplify the process of tracking expenses, but if you're charged incorrectly and didn't take a receipt you won't have any argumentative leverage.
I'll admit that I'm guilty of saying no to a receipt when in a rush, but it's not a good habit to adopt. 
As we spend money we inevitably collect a messy paper trail of bills, transactions and receipts.
Consequently, keeping your 
When it comes to managing my receipts my organizational skills are questionable at best. I store some receipts in a designated manila envelope, some in a special box and all my online receipts are scattered across various e-mail addresses.
