A lot of what is being discussed here and feedback we've received does makes sense, which is why we're delaying the launch of the addons category until we can sit down and properly rethink it from the beginning. Right from the start it's been a contentious aspect of the store.
Honestly I do feel bad about this as I know time was put into the pages and the beta. I really do, and for that I'm sorry. However, if you have made a plugin and associated services ready to sell, you are of course able to sell it on your own website and we're OK with people reasonably promoting websites and plugins on our forum.
Plugins have slightly more complex dynamics and implications which we basically didn't give enough thought to during the initial development.