Many thanks to everyone that responded
Over 3600 Responses.
Link to imgur album with outputs here
Results available as a CSV here
All the images and the (very messy) work in progress XLSX I used for some of the graphs are available as a zip here
Not mentioned in the imgur album, but possibly one of the more important bits is the top three manufacturers.
Honourable mention to IBM that just missed out on a top 10 spot despite not having manufactured keyboards for over 25 years.
The top 3 for people that said they primarily used Deskthority was actually quite different:
3. Topre/Filco (Joint)
Aaaand the bottom 3 (which was the same across all communities)
Other ways in which Deskthority differed from the other communities is that you have fewer artisans, own more keyboards (though I imagine that one or two outliers skew the average!) prefer vintage keyboards, have a much higher vintage keyboard ownership percentage.
I may add more images to the album, I'll post here if I do, if you think of any interesting relationships or possible patterns in the data that you want to explore let me know and I'll see what I can do, or better yet, make the graphs yourself and I'll add them to the album (with attribution, of course)
And finally, congratulations to reddit user /u/Luneth12 winner of the idea23 resin 60% case from busgamer7394.
Post from when the survey was live