if you were an impartial arbitrator in charge of dictating salary levels for a new airline, could you honestly look the staff in the eye and tell them you were going to pay the hosties more than the engineers?
It doesn't work this way, and nothing of the sort would ever happen: YOU as a cathegory have to negotiate your salary. If your salary is what it is, you have no one to blame than yourselves. Especially not Flight Attendants.