[Jack]

I am not a collector, but, before I did anything with that pistol I'd find out about collector value. Lugers often bring a good price.
As far as reloading for it, it may be easier than you think. I did about 2 minutes worth of searching, and found 2 jacketed bullets for the 30 Luger- one made by Hornady, one by Sierra. They aren't exactly 93 grains, but they're close enough. Winchester and Fiocci sell loaded cartridges for it. Winchester and Starline sell 30 Luger brass. Dies are available from RCBS, Hornady, and Redding.
So, reloading for the 30 Luger isn't going to be terribly difficult.
The 30 Luger case head is the same diameter as the 9mm Luger, and the case is the same length,which means 2 things: (1) no modification of the gun, other than replacing the barrel would be needed, and (2) if Winchester and Starline both discontinued brass for it, you could neck down 9mm brass.
I bet it would be cheaper to set up to reload for it than it would to rebarrel the pistol.