My 500 hours were part-time over two years, and I certainly never got anywhere near £500 a month. I got that figure from talking to poor full-timers who were trying to make ends meet. The point of my message, which perhaps I didn't put very clearly, was that if you want to pass on the 'joy of flying' (which, incidentally, is why I'm still driving 70 miles round trip to instruct for two hours) then go for it. You have to be prepared to earn b****r all while you're doing it, though. You could say in this case it's a vocation, not a job, but that might be going too far!
Don't get me started on the appalling way in which the flying industry treats instructors.. the red flag will be flying!
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"Take-off is optional, Landing is mandatory"