You get what they offer you, otherwise someone else will do it.
Depping, for me is mainly about networking, do a good job and you'll no doubt get asked back.
Last week, phone call Friday night for bass dep at a disco gig the next day £200. 41 song set, lots of new songs to learn, and the ones I did know where all in different keys/structures e.t.c
Pain in the arse, but it's all good fun. Keeps you on your toes!