Look at it as building a real partnership instead of just another order. That diner chose you, not some big supplier. @faithb74 makes a fair point about time, but bending a little for local spots can lock in loyal business for years. A small tweak now shows you care about their success. That goodwill comes back when they recommend you to other new places. Sometimes the hassle is just part of growing your roots in the community.

Is it really that big of a deal though? It's just flour and water, not a pet. My starter burps sometimes but I just wipe it up and move on.