Is it possible to post the total $$ reward pool cost from self-voting (at least from the users you track)?
And perhaps the total reward pool for that day?

Yes, we at Steem Coop are preparing a report on the last week and will include more relevant stuff like this.

The data might show that it's not as a big of a problem as we thought, but we will discuss this in the weekly report too. Please check it out, hopefully today or tomorrow at the latest.