I'm going to take a leap here and assume you enjoy saving both time and money. Flash freezing will help you accomplish both of those with little effort.
The money saving comes from stocking up when fresh items such as onion, potato, celery, carrot, blueberry, grape...etc are on sale. The time saving comes from having items cut and ready to use while cooking.
Let's use celery as an example. When it's on sale, I stock up and take advantage of the deal. I wash it and cut it into pieces I will use in soups and such. What then needs to be done is to line a cookie sheet with parchment paper, lay the celery pieces out in a single layer, pop the cookie sheet in the freezer for about an hour and presto! You have just done a flash freeze. Label quart size freezer bags with the contents and date. Put the frozen celery in the bag and toss it back into the freezer for later use. When you need some celery for a dish, pull the desired amount out of the bag. The reason for the flash freeze is to keep you from having one big frozen clump of celery in the bag.
I especially like to do this with onions so I get all the crying out of the way at one time.
Grapes and blueberries are also great for flash freezing. They can then be eaten either frozen or thawed. I do want to caution you though, don't thaw out a large amount at one time. Once thawed, the grapes need to be eaten in a relatively short amount of time or they tend to get a little mush factor going.
Watch those sale fliers for great deals, stock up and save yourself both money and time in the long-run.