I side with the 100% majority in that you did a right good thing there and should not be taking yourself to task for it. But since you feel guitar is your best instrument, and your fiddle repertoire is not extensive enough to play for hours and hours as you were kind enough to do, why don't you take your guitar next time and give a multi-sided performance? You can play a few tunes for the fiddle-lovers then a few for yourself. You're not likely to hear any complaints--unless you don't take your fiddle, then you will definitely hear about it.

I used to feel somewhat similar to what you've expressed when I was a hammered-dulcimer busker. Six to ten hours banging out my fifty tunes left me feeling like I was not going anywhere musically. I felt it was not my best instrument, but it was far and away the most lucrative to play on the street. Then I didn't practice or learn new tunes on it, because I was already playing it so much I was sick of it. Self-perpetuating cycle.

Willie-O