There's many reasons a band, a venue, and an audience either go wild or sit on their hands.
For me personally (at 70), and living here in Nashville with all kinds of venues for all kinds of music (believe me, like Austin, it's not only country music), that the world I came from, that music and the way we did things is past.
Times and the generations have rolled over, as they have and always will. Most people my age aren't going to clubs several nights a week as they once did, and today, I'm playing their parents' or even grandparents' music to 20-somethings if I were still out there. I'd be useless playing covers of today's music, and even here with many songwriters (and TONS of other musicians), there are loads of original music situations, often songwriters, more often than not, played for 'exposure'. Hard to go to Publix with a wallet full of 'exposure'.
The world I worked is gone, save for the occasional Oldies Cruise or some Eagles Lodge or VFW with folks my age. This makes me feel even older (I'm just waiting for the Stones or McCartney to be sponsored by Depends or Viagra), and I quit trying to get in on them.
It's just over. I made peace with it, play what I want around the house, and usually succeed at not being the Get Off My Musical Lawn guy about it.