No-Req and Low Req shields

Ok, so I know r7/15s and r8/16s' values fairly well, but what about lower rx/max shields? I can see why r4-6 are worth nothing, but what about those that can have a couple points dropped into a skill tree for a small armour buff? I tend to keep them for my monks as caster shields for a variety of builds, and find them useful. Anyone else?

PC on:

r0/8AL (I know any gold you don't meet the req of is just as good, but what about people paying 30e for a wintergreen?)
r1/9AL
r2/10AL
r3/11AL

Assume all are tactics, inscribable, and common skins.

Insights, prices and suggestions welcome.

0/8al prolly merch since a person can use any skin they want and get 8al from it.

following the same idea, I would say they all prolly merch food.
wintergreen was a special skin

From all the low req shields (from r1 to r5) I believe that only an r3/11 is worth keeping - it can be used by any profession going the 12/12/3 attribute split, making a nice defensive set.
For the higher ones r6/14 have been selling pretty exceptionally well for me, but common blue r5/13 I would merch.