Re: On occasion
This happens with volunteer stuff too. At some point people expect that things get done and can be pretty rude when they're not. At that point the volunteer might well say "sod this" and walk away from it.
That ties in with an earlier discussion where I stated I would never take on work for a charity. This is basically reason 2 after "unlikely to ever get paid": you tend to inherit a mess which is a bit like a house of cards or an erect member: it only stays up as long as you don't f*ck with it (my apologies for being crude here, but I suspect that anyone who has ever been near such a situation must be a saint not to utter a few words that would get bleeped out daytime TV).
The problem is then that YOU were the last one to touch it, so it's your fault now and you end up fighting to get this mess into some shape before you depart - without any expectation of payment, or appreciation of the valiant battle you fought.