PC on Curious Bow?

just looted this bow and i haven't seen one like it before.

Icy Composite Bow of Warding
Cold dmg: 15-28 (Requires 10 Marksmanship)
Damage: +15%
Health regeneration -1
Armor +7 (vs. elemental damage)

the part i found curious was the +15% -1 health regeneration.

15/-1 is pretty rare, but it's a normal inherent mod sometimes found on oldschool weapons.

As far as I'm aware, there's no particular demand for it, since it's exactly as effective as any other combat-enhancing inscription, but with a more annoying drawback. Merch food.

Normally the wanted dual vamp weapon is one-handed so the bow is kinda out. With that said however, I sold a q9 celestial longbow dual vamp for 20k