It is possible through sql manipulation but would still be a tedious process depending on the target db structure.
Will it be possible if I decide to use another platform like joomla in future to transfer member details/registrations to the new website from wordpress (or would ever member have to painfully sign up again).
Yes, as with the other other theme package, you can upgrade to the next level license.
- If I buy the club edition of classipress and need psd files later, will I simply be able to upgrade to the club developer edition?
As mentioned in the FAQ page
http://www.appthemes.com/support/faq/;
"These source files are licensed and copyrighted under AppThemes and are not GPL. You may not redistribute these files or claim them as your work."
- Also, can the psd files be used if they are not licensed under a GNU license?
