Looking at the responses to 39 questions of mine deleted, and counting. How do you expect users to write well written questions? it strikes me that upvoting questions which warrant upvotes is needed more than what is currently happening.
As I mentioned in a comment, I think the lack of upvotes can also be an indicator of the range of members here. Those who would find such niche questions useful to them surely would upvote?
The questions discussed in the first link are niche questions but it doesn't mean they are not useful to someone else. Even though they may be niche questions, surely they would be useful to general practitioners who have patients suffering with tendinopathy related problems?
I think the upvoting issue does need addressing. I try to remember to do so myself, but we need to be upvoting more as a community. If the question is on-topic and well researched, it can be useful to others so it should be upvoted. That way, issues like the automatic deletion of good questions won't arise though no upvoting.