I think I agree. Just do the sums. A PPL instructor might get £15/hour. Absolute maximum is some 1000 hours per year, realistic is more like 600. So, could you live the life you want to on 9K to 15K a year? If the answer is yes, go for it. If the answer is no, why not consider getting an instructor rating without giving up the day job?
Good luck whatever you decide.
Gerard