Other than being unique, historic, and mechanically interesting, it doesn't seem that ammo is as hard to find as more common rounds in today's ammo crazy times. Not cheap though.
Stopping by Cabela's the other day I noticed the whole top shelf of a 4 foot section of shelving stacked high with Privi 7.62 Nagant. Of course it was $25 for a fifty round box.
Cheapshooter's rules of gun ownership #1: NEVER SELL OR TRADE ANYTHING!