Then from my experience I don't understand why they're called GM's.

In other MMO's GM's are capable of handling a wide range of in-game services that include item restorations in the eventuality of mistakes and aren't limited by some arbitrary restriction/s. As long as sufficient evidence is shown that a mistake was made it should lie perfectly within their capabilities to help.

In all honesty it feels as though what we actually have is a glorified police force that have been given the GM title, but with very restricted GM capabilities. Which; also in my opinion, needs to change.