I think you may be mistaken, I run my we scar at 65psi and it still shoots 350fps the standard pressure of green gas is 115psi so it is lower also with a hpa system you don't encounter the freezing mags issue so you can fire the whole mag of 450 rounds on full auto whithout any issued. Ware on guns is partly caused by ware (bolt moving ect) but it is also caused by the bolt hitting the bolt stop ect so the lower the pressure you can run the less hard the bolt will hit it and the longer in theory your gun will last.
I am sorry for any misunderstood statements and I should have expanded on them at the time of posting.
Thanks Henry