I am never going to use my 30 veteran scrolls, 27 mafioso scrolls, or 28 werewolf scrolls. they're just sitting there.
OTOH, I will use up my witch, jailor, and medium scrolls, and probably buy more when I run out.
I propose recycling scrolls into a new scroll. 2 scrolls recycled = 1 random scroll, 4 scrolls = 800 MP so you can pick whichever you want.
Recycling would give a chance at juggernaut.