It can actually be more than that, it's all negotiation and quantity of miners running the firmware. If you have thousands you get a lower fee, in awesomeminers case the dev fee is 1% and awesomeminer adds 1% for themselves. The 17 series can be different but in awesomeminers case they take a portion so they can develop a management system that works better with that firmware.

Now I have no idea if these features are worth it, they might be worth it to some. I've tried awesomeminer and I actually like it, however at scale it just doesn't make sense. It's a very nice ui and 90+% of the features can be replicated if it's worth your time. In my case it was since the work arounds to get awesomeminer to work the way I wanted it to just weren't there.