I spend a fair amount of time dealing with receipts of my own thanks to Ibotta and Receipt Hog. I have observed from my own some of my spending habits I could stand to break. The good news: I am learning to cut down on my book and magazine purchases and use the Food Lion specials and instore coupons to save a fair amount of money there. I also limit myself to $20 at the farmers market most of the time. I rarely indulge in eating out if I can help it.
The bad news: I do tend to forget I have purchased something and tend to end up with a lot of extra items such as canned goods and my morning drinks. I will try to monitor my stocks so as not to overbuy.
Since I am used to dealing with small pieces of paper my main point of interest on Amazon HITS is entering items from receipts or classifying them for bits of cash. I haven't cashed them in in about 3-4 weeks so I must be learning to save more. Having said that from what I put in it is amazing what Americans (me included on occasion) waste money on. I can always tell the official and unofficial Mustachians from the large amounts of discounts and or coupons I have to enter lol...
From the not so enlightened's grocery receipts I see a lot of processed goodies such as Kool Aid Jammers, Lunchables, frozen convenience meals etc...From their restaurant receipts a tendency to order expensive items and lots of drinks.