Perhaps you’ve had this experience with your monthly budget money: 
At the beginning of the month you allocated “X” amount for a particular budget category. Due to clipping coupons, noticing that sale item or exercising some intense discipline, you didn’t end up spending as much for that category as you had planned. You had extra money for that budget category that went unspent for the month.
Putting it into an example - you budgeted $600 for groceries but only spent $525. You thought that dress would be $100 but you lucked into a half-off sale. There was no car maintenance for the month and the $75 you earmarked for the car maintenance budget wasn’t used.
So there is extra money available to be used in that expense category. What do you do with the extra money? Where does it (or should it) go or should you spend it at all?
You may have never thought to ask those questions, but there are actually some issues here that need to be addressed. I can think of three different options for your extra budget money at the end of the month, with one of them being the clear cut winner in my book.

Say “No” to them and it seems like you don’t care.
After we bought our first house, I began to look into this issue. I read many opinions and ended up agreeing with the major arguments for NOT paying off the mortgage early. These points seemed solid to me. The logic goes like this:
The huge advantage of this is of course saving time. There is no need to unload and then re-load your shopping cart at the checkout line. You can skip that entirely! And that is a huge advantage when you are shopping at Sam’s, especially during peak hours. Sometimes those checkout line waits can take forever.