I don't have my Ph.D. yet, so I haven't seen that whole postdoc ball game, but here's my opinion...
I consider postdocs resume boosters. You take this 'pay-cut' kind of job, put it on your resume, and when you apply for a 'real' job with 'real' pay it helps your resume to stand out from other newly graduated Ph.D. 'postdocless' appliers.
This may be crazy thinking, but this is my reason for when I will do a postdoc and take that ridiculous pay and lawless appointment.
If someone thinks that they need to straighten my thinking...I'm all ears.
apallas at ARSERRC.gov
US Dept. of Agriculture