Goin' once in a while all the time. There were years full of live performances upto 10 times per season(usually when cold and nasty)... Been a few times on open arenas in the nice summer days too. Providing occasional assists to local bands for live stage and studio recordings. Had been a few times in tech crew with famous bands such as Black Crows and Cold Play and listening them back-stage free.
Listen to Jazz at the jazz bars live... No worries to me if there are sounds of flatware or glasses. Most of the ambient noise dissapears if band is intended to be the main event of the evening and not just a background performance.
Listen to the rock through cheap and expensive PA systems... like to see them play, like to share traveling joint through the excited crowd and don't give a puck that my stereo may sound better for the same song... not the point at all.
Listen to the classical music in concert halls live and could tell ya that no way any stereo or PA system in the world can match to the quality of unamplified sound in the right venue.
And lastly, Home gig sessions! Simply self-entertaining, enjoying with few shots of bourbon or whiskey -- Let's begin from part A! Same joy at camping gigs.
Last time I've attended "Dead Can Dance" a month ago in Beacon Theatre NYC and happened to accidentally occupy lodge seats that matched my low-balc seats... Nobody showed up to claim, but the seats were FANTASTIC on the lower part of lodge. Sound, artist and venue was superb.
And lastly, good musicians to me will always sound good: PA system, my home rig, 96kbps-Youtube videos, I do not care.