I'm currently in the process of redesigning the website to be more user-friendly, mobile-friendly, etc. I'll be re-launching it in 2-3 weeks. Here's what you can expect when it re-launches:
Membership format: I've been doing the pay-per-download thing and it's not a very good way for users to manage their purchases. A simple, affordable membership format will solve that problem. You'll be able to download as much as you want, whatever version you want, for as long as your subscription is active.
A new joomla template: I'm working on a new one using the T3 framework. It will be flat/minimal/clean and available in both free and paid versions
Free membership for previous customers: As a token of appreciation anyone who has purchased a template from me in the past will get a free 30 day subscription if they want it. This also applies to anyone who purchases a template from now until I relaunch.
Since I started themeKat 3 years ago my templates have been downloaded a grand total of over 100,000 times! Thanks to all those in the joomla community who have supported me and downloaded my templates, I really appreciate it :)
~MJN (theme designer/web admin for themeKat)