evidence....out of this random tread i started 3/11 people said they sometimes pass on these credit minimum stores, because they don't carry cash. Forcing us not to support the local business. I personally spend about $40 a week at starbucks, i would much rather spend at the local spots if they accommodated me. i'm sure there are more like me.
None of that is evidence. The plural of anecdote is not data. Also, please, you aren't being forced to not support local business. You have a choice, and you choose not to support local businesses
Businesses will cut the minimum purchases to accept a credit card if a large enough segment of their target market makes a fuss about it. Prices would going to go up a bit to cover processing fees. I think since many haven't, you can take that as evidence that you are in a pretty small minority for now.
Additionally, food related businesses are usually pretty small margin businesses, and unless there's evidence that customers are likely to spend more on an average purchase when they can use a card, I think there isn't much incentive there. For example, in restaurants, it was demonstrated that people who can use a credit card to pay for a meal are more likely to spend more for their meals than someone paying cash. So there's a pretty solid business case for why those businesses should have accepted cards and the associated fees (which pre-Square, included a transaction fee for every credit card swipe). All cash restaurants are still around, but they are far less common today than they were 20 years ago.