No need to insult one another, gentlemen. At the end of the day, everyone will be doing whatever they see fit for themselves. You're good at fixing pipework and want to make some extra money out of it in your downtime? Great. You feel that doing this sort of work is inappropriate for a pilot and sends the wrong message to the public? That's totally fine as well. It's your life, your free time, your income. You be the master of it. Nobody should be telling you what you should and shouldn't do unless they will be sharing your bills at the end of the month.