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Those are also possibilities. Keep in mind that basing on comments may favor posts that foster controversy and arguing. :c)

Also, the steem for 'pinned' time sounds interesting. How does this compare to 'Promoted' posts?

from what i can work out "promoted" is for the full 7 days. pinned would be for a maximum of 6 hours.

I can see there being potential in exploring different possibilities here.

A little like google's ads at the top of searches. Maybe an auction for tag prevalence option.

yer it would also allow steemit to offer more money for it's posts. more money for everyone, lol