Thanks for the results, and nice walking through them. Just my two cents on some points:
I don't think the horror FVN "popularity" comes from authors trying to please the audience or feeling pressure coming from them, but rather that it's more so the authors themselves the ones interested in the genre (kind of like the joke that FNV authors are more interested in incest than their audience, which this survey proves false).
As for the Patreon vs single payment question, while unfinished games and "bad actors making minor updates just to cash in" are a reality, another thing to consider is total investment. Sure, 1-5 USD a month may not feel like much and it helps with development by covering art/writing/etc. costs, but your average FVN takes years to finish (if it does in the first place), and it would not be unusual that you'd end up spending hundreds of dollars in total (for example, if you had backed Echo from the beginning at their lowest tier, that'd be 207 USD, which is over ten times what the results consider a fair price for a FVN that they absolutely love).