never, ever underestimate the value of pgems.
it's sometimes surprising what people will pay for 40 pgems.
ps: lightsabre (2pgems tops), Ali Baba (maybe 5, probably less later in a ladder season. Phree Phor Nubs on NL) and G-Bane (maybe 5) are no longer considered "high-level" gear.
Actually wouldn't it make sense to dupe pgems?
I mean, if you cannot tell if an item have been re-rolled by duped pgems, then its the safest thing to dupe - if you use them straight after.