Not a good idea as i see it. Offering the themes separately would mean i have to create a separate membergroup + subscription for each single theme. Would be a real pain if you have, let's say, 40 themes and offering them for two platforms lol. Besides, some people will still need support and then start asking their questions in any of the public boards.
No, this has been discussed many times but we still feel the current setup is the best for everyone.