"$20 per hour is a slap in the face after the events of last year"
Totally agrees with this comment. Also, you need to look at whether you are hired as a casual pilot, or "sub-contractor". If you are hired as a subcontractor, then really, it's actually less then 20 dollar because you'll have to pay tax yourself.
Also, is it 20 per flying hour? per duty hour? per "working hour"<-- sounds silly, but some company expect you to do work/maintenance job around the premises, and you won't be paid!
Now, how many hours are they promising you'll do? Are they providing accommodation and food? Because if not. Then you'll be hard done in trying to support yourself if they are paying you flying hour. Just imagine you get only 3-4 hours worth of flying that week. In a remote area, that is pretty much all your groceries pay!!!
HHOOOOWWEEEEEVVVEEERRR!!......
At the moment, the industry is again, not the same as last year. So, given the work opportunity is very sacred at the moment. You'll need to make the choice yourself and weigh up the short term benefit and cons.