Hi there!
I'm Riot aeneia. I designed, wrote, and launched this survey.
I can't address everything you've brought up here, but I did want to mea culpa something, and hopefully provide a little education:
- That first question, about how recently you purchased in-game content. That was my bad. I forgot to include the option for "It's been more than a year." I done fucked up there, and I'm sorry to make anyone feel like their historical purchases weren't important :(.
- As for the rest of the survey, I'd encourage you to look up Choice Based Modeling and Max Diffs. They're pretty brilliant methodologies that help us to prioritize different concerns. (And, yes, we know that something being knocked to the bottom of the list doesn't make it a non-issue. It just means it's less of an issue than the other things above it.)
- There's more to the repeated questions than just filtering out troll responses ;). Like I said, do some research on Max Diffs!