It also depends on what you are buying and what payment methods they will take.
Note, we don't live in a fancy area so our options are different than many fancy places.
I'm about 40% on putting used cars on my credit card from dealerships. Some do, some don't. Credit card is my preferred method for most things. I've done a check for one. Cash for the rest. Cash has never gotten me a discount, they would rather I finance, which I don't do.
We have had some home repairs done and some of the places do checks, some want cash, some do cash discounts (as in true cash- they like greenbacks), some do credit cards, some only debit cards, some cashier check only. We have never had any work done that has taken financing, the big work we have done ourselves over time so the pieces went on credit card once we had the cash reserves to pay it of.
Everything we have done has been cash equivalent, the credit card is just a pass through for control, timing, and cash back.
Loren