I'm just guessing, or maybe hoping is a better verb in this case, they will either not allow purchases of the BG spaces the day of or at least after the VQ is set. I expect that unless they price them really high the effect will still be that there is little to no chance of riding without purchasing but if they allow purchases after the VQ each morning the chances will drop still further. As the de facto
travel agent for my group on my upcoming trip I've already asked family members to start thinking about how much, if anything, they're willing to pay to ride RotR.