Risk takers and risk evaders
They say that as comedians get older, they stop making jokes about drugs, sex and hedonism, and start focusing on the price of childcare and mortgage approvals. As their fans are ageing with them, many become oblivious to the drudgery of another "kids say the funniest things" routine. It doesn't need to be original or edgy, it's just a relief to be out on a Saturday night without a baby monitor. (For evidence of this phenomenon, see Michael McIntyre gigs.)