I love your themes, I think they're the best thing out there for developers. And I guess a developer can simply use the joomla format, but I think if you made it a bit easier for say a rails developer to us immediately after purchase, you could make even more money. I guess it only takes a few minutes, but that said, you can appeal to a much large group of people.
I'm not sure how they could be made easier to adapt for other systems. . . The templates are mostly HTML/CSS/JavaScript, which pretty much stand alone.
The module loading is probably easy to adapt. The hardest thing would be the menus, but those could always be hardcoded with a standalone menu system.
I'm not so sure what else could be done to make it easier to use the templates with another system. ???
well i dunno i guess i'm lazy. i mean your target is joomla users and not everyone. in order to see all of the css output I have to install a rocket launcher to see everything in context (or scrape your demo server i guess). would be nice to have a chart of possible combos and what they look like. I guess it's not a big deal, but it does take time.