Great site you have here, I really wish i had found it and understood WP GPL licencing earlier, ive already paid for some of the plugins you have available and never use the support. I have come across a few sites like this now that ive been looking and so far yours is the only one that is completely free, others seem to have membership programs.
One thing I will ask and/or suggest is regarding updates for these plugins. If you dont already it would be a neat idea to push out some emails when a plugin a member has downloaded (as you record this data) gets updated, this would help people stay up to date and secure, and coupled with the community support forum you have here that covers all bases really and means there 0% need for purchasing these types of plugins from the authors.
I do like to support people for their work but am tight for cash right now, so your site has enabled me to pimp my store with no more financial stress.
Another thankyou especially for the csv importer plugin, this plugin and its competitors are all around 150-200 USD, now for a plugin that I will use once to import my store and very occassionally to export it that is alot of money, so thankyou for providing such a highly useful plugin at no charge.