The keyword on that link you provided is "available" tickets. The fact remains that Jay Leno does make "good money" off of his standup appearances (a correct point by "weegee" which you ignorantly mocked) and he does live off of his standup income.
"He DOES NOT spend his weekends doing standup. I checked several sites to check my understanding and Here's one that uncovers FOUR days he is appearing from now until March 18."