Consideration is a waste of time, since the most useful part -- voting to edit a node in some way, is the form of consideration least acted upon. It's mainly useful for reaping at this point. I used to hit Nodes to Consider religiously until someone pointed out the above.
So, people will either be voting on an edit that will likely never occur or voting on whether to reap a post or not. Both are subject to abuse and both present conflicts of interest.
What we really need is a larger group of editors that will actually act upon the edit considerations. And if that did occur then I do not think we would need to offer XP as an incentives to vote.