joel, i'm in your same situation, only i have a camping pass. i'll be within the grounds, but without tickets. my goal is getting tickets for fair price. i missed out on buying. it'll be my first time. i doubt there will be tickets at the door. i do know there will be people selling. i'm pretty sure we will find single day tickets priced free to $120. i say dont sweat the tickets. make sure you have a place to stay, first.
btw joel, a three day pass is just really three separate tickets. the "pass" is a term used to group the three tickets. when the three day passes were on sale, they collectively made each single day ticket less expensive, for people were investing into more days at the festival.