A nice article on Smashing Magazine reviewing some of the popular Magento theme clubs.
WordPress professionals are faced with many options when deciding which membership-based theme providers are worth their investment. It is important to know how frequent future releases are, what your actual cost will be over time and what kind of support you can expect. It is also important to know what types of themes you will be gaining access to. What I will provide in this article is information to help you compare the details of popular WordPress theme clubs, so that you can more easily determine which might be useful in your situation.