The OH mechs are very talented mechs with the same responsibility as line mechs, but OH work is being farmed out to MROs that have a different pay scale and work rules then line mechs.
For instance OH mechs work one portion of one fleet, while line mechs work all systems all fleets, but OH mechs get deeply involved in that one area. Line mechs work 24/7 operation, while most OH mechs 5/8s with sat sun off. All line mechs require an A&P license, while not all OH mechs require an A&P license.
American Eagle mechs make less then AA mechs, just like WNBA players make less then NBA players. We all have the same responsibility but it's what revenue you are generating or what your competition is. Same with pilots and FAs, Eagle flight crews have same responsibility but make less then AA flight crews.