Anyone can do this now using the beneficiaries feature.

For example, @steemitblog makes their posts with 50% going to burn (@null) and 50% going to SPS funding (@steem.dao). I'm sure they get more votes as a result (I know I vote for their posts and wouldn't otherwise).

There is no reason other people can't make better, more appealing burn posts than mine or potato. I'd even vote for them.

Some posters try to have their cake and eat it too by sending a tiny amount (say 3% or 5%) to @null while keeping most of the rewards, but that doesn't really work as it isn't enough.