I did quite a few A310 ferries worldwide, mostly from or to the Mohave Desert.They all came in ad hoc on a weeks notice, and lasted between 2 to 7 days. Once you do a few and "get things done" without too much hassle, you will get more offers. Forget your company standards and S.O.P. s. You might have no correct database in the FMS, no t.o. analysis etc. (120-130-145 usual works), and planes could have been sitting in the rain outside for a couple of months. Expect discrepancies or things not working at all.
I would say not really for the unexperienced ones.
And no, even is the occasional pay is well, you cannot bank on it to make a living. You also should schow up with a valid license and medical, not to forget recency of experience on type.
But it is great fun! Nothing like crossing the pacific in an old non etops A300B2 and overnight in some remote atolls!