I have more then a couple of buckets of modules that I purchased from vendors other then GHI (I've got a couple of buckets of modules from Justin alone) and I can tell you the loyalty that GHI has built was very well earned. I ended up writing or having to maintain the drivers myself or in some cases tossing the module as I suspect the hardware (likely the connections) were just wrong, such that no amount of software could fix it, but that is part of the risk of buying hardware from smaller or independent vendors and clearly I'm OK with that, but if folks want the same level of loyalty that GHI has then they have to earn it just like GHI has, so don't blame them for doing as good a job as they did. The level of quality and support that GHI offers is second to none and that is worth money to me, so I never minded whatever premium GHI charged (I'm not really convinced they did as whatever I got from them I considered an excellent value). To be honest most small vendors I dealt with often came up a tad short on their products on a number of fronts, be it marketing, drivers, support, etc and I think they will need to learn that IoT, Makers, Students, etc aren't just another hardware dude, and hence need a better full meal deal so if they want to be successful, even on another platform they will need to step it up a bit.
Again I'm sorry that Gadgeteer has slid into history as I thought it was an excellent platform for hardware dudes to make and sell modules as modules could be a nice clean and complete product that consumers would love as they gave them a usable and useful experience right out of the box.