They are unobtainium.
Why is there a cult like following for arsenals but other countries no one seems to care about?
In short ... FOMO. Folks forget that when the SLR-104 for example was widely available and already cheap spam cans of 7N6 were always on sale, not a lot of people were buying them. I was one of those people. "Who needs yucky corrosive ammo when there is so much good 7.62x39 ammo out there?" "Do I
really want to invest in another caliber, and have to buy new mags for it? AK-74 mags are $20+ each ... too expensive for my blood." Current me meeting past me:
Russian stuff still typically commands a premium over most other eastern bloc variants (especially those krink kits), but as
@Dan0311 mentioned, Arsenal was one of the few factories with strong western marketing and following, churning out factory Russian and Bulgarian commercial guns built right alongside their third-pin cousins. When that stuff dried up, somewhat coinciding with federal embargoes on stuff like 7N6, Saigas, and VEPRs, many American AK fans (like me) freaked out and scrambled to catch up. Dwindling supply using means higher demand, and that dwindle has never really ceased.
Will a $3,000 Arsenal SGL shoot better than a $750 WASR? Not really. Is the quality fundamentally better? Um, kinda? So besides the collectibility aspect, FOMO has to play some part in why I'd rather have one more Russian AK vs. four more Romanians.