Those with GA accounts have an advantage. This also may be driving away users who are frustrated with it.
If a market uses a Gallup number then set the end time on the final day at 11:00 EST to eliminate that final day advantage to those who have GA accounts.
Similar to locking debate markets before the debate starts or half way through.
Anyway who doesn't want to be a "victim" of insider info can just pull their bids.