I wouldnt be too worried about something like OSL selling out quickly. Theyre still a young festival, and recovered nicely with some breaks in weather and doing 2 days one year to make sure they could keep pulling the event off. If they are going to stick to the weekend pass only when general onsale begins, a lot of people will not bite until a day by day breakdown and singles are sold. thats what happened last year, and probably the same this year. Same goes for Lollapalooza, despite having a top heavy line up, it didnt sell out until after they released single day tickets. Bonnaroo will take some time also, even though they will have some attractive acts near and at the top. A festival like Sasquatch sells out quickly because it has a giant handicap of a very limited capacity. If they were able to have like 50,000 people in their venue, then it would take longer to sell out with the kind of line up they put out last week.