Nick, great points, especially…
“The more themes you create, the harder it will be to update and support all of them. You see this a lot with certain theme clubs were most themes don’t get updated much after the initial few months.”
That is why I love GP, I think quality over quantity is key. I also love finding a theme like GP and getting to know the ins and outs, slowly build some custom css and php libraries and being able to reproduce any layout I want. The need for 40+ themes in a club makes no sense to me personally.