Listen to them, they know what they are talking about.
In 2011 tickets sold out pretty fast (though not in a day) and everyone went nuts and paid hundreds over asking. Then, as the fest got closer prices slowly went down to the point where people were selling them for face value or in some cases even less.
And because everyone loves proof here are what coachella ticket prices on stubhub looked like last year. Note how they just keep getting lower and lower and eventually some people got tickets for less than face value.