Branget you hit on this, it is easier for someone like me to just buy a comic with a 9.8 for say 30-40 than buying the comic, waiting for a con (I don't like mailing in comics), driving there, paying for the ticket, then getting it submitted. Especially if said comic comes back 9.6, then it would all be a waste of time. I don't generally submit multiple copies of comics either. I'd just be left with a 9.6 to sell on ebay and use the money for a 9.8.
Other people may do it differently, this is just me.