I think it comes down to enjoyment. I think most things in life do. Second best is doing something it doesn't bother you to do if it will get you something that will help you better enjoy life.

So anyway, if you like entertaining, by all means, keep doing it. It doesn't sound like you do, but I've met folks who love it. If you don't mind doing it and you can use the money, decide whether the positives outweigh the negatives. Sometimes, even the little inconveniences can slowly nibble away at you, and you don't realise how much until they're gone. The best of all possible worlds is being able to do what you love and nothing but what you love. The most successful humans, IMO, are ones who can manage that.

In answer to your question "Is it woth singing Wild Rover to a pissed up crowd for £75..." my answer is "I dunno - is it?"   I've heard you, Spot. The cherries should jump off the trees into your basket.