Being a new member of the community, a novice theme developer, and service provider I offer a new perspective for consideration.
As service providers (who happen to build websites for our clients), we sell time to our clients. We develop our niche market, make our presentations and do our level best to deliver excellent service. WordPress--as a development platform--make web development affordable for the smallest of budget because we, as developers, don't have to pay for the basic platform.
Justin, you've added incredible value to the free WordPress publishing platform, but that value is only realized by the web development community (i.e. us). Take this a step further, Justin, you've created a platform where a novice web developer (like myself) can create effective websites for our clients at a price small and start-up business can afford.
Just like I sell my time to my clients, Justin, you sell your time to us. Opening this forum to end users would be problematic (at best) because for every web design approach there are a hundred different way to accomplish the task. Since the end user wasn't the creator of the design approach, most of the support time would be defending a design approach you (and your team) had no input in creating.
My suggestion is as follows:
Justin, you raise your annual membership fee to the developer community to a level where you can make a living and continue to provide amazing support to us. We, in turn, will continue to use the Hybrid Theme Framework to create effective websites for the business market, eventually making Hybrid the most used WordPress Framework.
If we start trying to charge per theme, then I believe we are missing the point Matt (and Open Source) supports so passionately. It is not about the creative, it is about the service.
As Hybrid theme developers, we should all feel comfortable freely sharing our theme designs (with a few exceptions) because the foundation we used to create the theme was FREE. Notice my use of the word should...each developer must make their own decision to freely share or not--just the same as you have Justin. I my case, I long for the day when someone asks if they can re-use one of my themes... The answer will absolutely be yes and I will be flattered when that person improves what I did.
Sorry for the length, but I am passionate about Open Source and only hope my thoughts help the discussion progress.
Thank you Justin (and everyone else) who is helping make the WordPress community bigger and better.