Can you please elaborate? Why is it not interesting to know how much is in the bets? Isn't it way more interesting than the volume if any party can just spawn and wipe out volume? If done quickly, this should boost the volume for free. Granted, it would also increase the "open interest" for a second but that's easy to ignore if you track the median open interest over the last week or so.

Also how do bets get bootstrapped? So there is a bet X. How is liquidity created. Who determines the price initially? If I think, odds are 20%, so I would be willing to buy yes for 19ct and no for 79ct, who do I buy from?