This topic affect only Kongregate users (well i have no information about ArmorGames payment issues).
It's nice of GH for releasing paid stuff cheaper, but making purchase via kreds on kongregate is BROKEN.
I did wrote some support tickets, also in technical forum, but this problem last for few months and many players feel like you avoid this problem.
Im not complaining about any migrations from kong to steam etc, just it would be nice that everyone had same chances to obtain stuff they want (especially, when you have currency needed, but can't spend it on).
Also, Kongregate admins already checked this problem and they can not do anything about it. Probably it's an issue when GH took Spiral Knights from OOO filthy hands.

P.S It's not valid forum for my problem, but i have a thoughts that Grey Havens admins got an eye only in general discussion forums only.

Peace.