RE: Don't use vote-selling bots: use @promoted instead. A bot that upvotes you when you burn money!
Awesome it is a very good idea from @fabien to improve the value of Steem in the long term.
However, I think the most important improvement is to give a custom vote close to each user's SBD burning. If someone is burning 4 SBD he or she deserves to receive an upvote close to that value. Calculating it is already possible and as long as SP pool allows it , that could be used.