Plus, why should it cost any more? Same festival, same camping, same level of music (roughly speaking). Hard to say why that costs more, other than the general principle of "charge more each year."
Sasquatch price increases have been roughly on pace with inflation and Coachella charges more because they can. They are all businesses trying to make money so charging less when people will pay more doesn't make much sense.
Thankfully Sasquatch had a slow (non-existant?) Sellout last year so they know they can't charge much more than last year.