think an exception should be argued for DMsGuild Community Creator products, since not everything needs to be boycotted to achieve the objective of grabbing Hasbro's attention and focusing that attention on the WotC execs responsible for managing the DnD brand and related licenses.
To financially attack or harass small developers who might need the income to supplement their living in the current bad economy even though they have nothing to do with decisions regarding the OGL is like throwing the baby out with the bath water and potentially adds hypocrisy to the motivations behind the boycotting.
DMsGuild creators are contractually bound to keep their stuff on DMsGuild so they can't move themselves to a new store.
I'm not unsympathetic.
But to WotC a sale is a sale.
WotC suits don't differentiate things they way you or I would. They see money hit the WotC accounts - they see support for them.
Lots of people are gonna get screwed over by WotC revoking the OGL that people used in good faith.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.