Why is the Tower Theatre So Expensive?

Tickets to the Fleet Foxes' May 21 show at Upper Darby's Tower Theatre range in price from $96 to $331 when purchased directly from the venue on their website. I'm a casual fan of the Fleet Foxes and had some interest in going with my Special Lady, but not if I've got to shell out ~$200 for the experience at a minimum. This also leads one to wonder how many rabid Fleet Foxes fans out there are ready to plunk down $700 to treat themselves and a friend. Is this a glitch or do I just not know all the rich-ass mofos who love them some Fleet Foxes?

Another exciting show coming through the Tower Theatre is Eddie Vedder, whom I last saw in Philly during Pearl Jam's epic 4-night stand to rock out the Spectrum in 2009. This time it's just Eddie (presumably with a guitar, at least) and the Tower Theatre is selling tickets ranging from $126 in the nosebleed zone to an astronomical $868 for row BBB in the orchestra pit:

 

I mean, those are sweet seats and it is Eddie Vedder, but $900 for a ticket? $1800 if you want a friend to corroborate the experience? (Which you must if you're going that far to enjoy yourself.) I'm not buying it. So what's the deal Tower Theatre? How special an experience are you peddling? For $900 I'd want guaranteed access to a semi-serious friendship with Eddie Vedder.