This is a good idea, to burn, it's like buy-back option some ICOs have. In theory, then the Steem token value should rise...but not sure if there is the same case. At Iconomi they have buy-backs, but the number of their tokens is limited and each burn rise value. At Steem, the number of tokens is not limited...or I miss something?
Anyway it's worth to try...
Yes, it is the same idea behind it. The promoted amount gets burned.
You can see the effect here: https://steemit.com/@ervin-lemark/transfers
Yeah, I know, I also promote one post, but not sure how the value of steem will rise because there are tokens generated anyway...I mean the value couldn't rise as much as via buy-back in a limit token environment...