Engineer in SC = $73,607.
Production assembly = $15. P/Hr. to $20. P/Hr.
Engineer in WA. = $87.703 Which is >$14K
Production assembly in WA. = $20.57 P/Hr. Which is >$.57
So, while more technical degrees are substantially higher in WA. as opposed to SC, hourly wage on the line seems to be pretty close.
So, this argument of "reasonable" considering cost of living, and equal factors is a non factor.