Is it considered "cheap" to not eat dinner at your ryokan?

I'm booking accommodation near Izu Inatori for the dontsuku matsuri (don't google it at work!) and I'm considering whether to book dinner at my ryokan.

I suspect that I'd rather be able to eat out so that I can eat with fellow revellers, and then continue drinking into the night, rather than head back to my ryokan, eat dinner, and then call it a night.

The problem is, I'm a solo traveller, which is bad news for a ryokan owner during a festival as they charge by the person, not by the room. Choosing not to eat dinner is even worse news for the owner.

In Japan, is it considered "cheap" (as in stingy, miserly) not to eat dinner at your ryokan, or is it socially acceptable, even during a festival?