I never even mentioned record sales. I'm just saying that bands want fans who keep coming back over and over. They Might Be Giants are a good example of a band with a very 'sticky' fanbase.
The motivation to keep fans coming back and not seem "too greedy" keep things in check but the balance of motivations has definitely shifted towards: we want more money from live events.
Decades ago concert ticket sales might have been considered almost a loss leader.
My point is that is just one of many factors influencing how bands price their events. And that range of factors has changed over time.