I don't think this is a good idea. Especially since the way the system is currently set up, you cannot later increase the payrate for your delegate.
I think the gains that burning fees gives to shareholders in these early stages is so small compared to the gains which can be achieved by greater user adoption due to using the money on strategic development / marketing / business deals. I would rather see delegates campaign on giving a huge fraction of their collected fees to groups that stakeholders think have a good business plan for increasing BitShares X adoption.