3 to be precise, both days in 2004 and 2nd day last year.
If Coachella isn't your cup of tea, I suppose any price is too much. If it is, then less than 2 bills for 3 days is quite reasonable, in the past single day sales at the gate if available have been $90, sure to be more this year.
I'll grant going from the east coast requires additional expenses and the weekend as a whole isn't exactly cheap, but there are few things happening in the States that are obligatory and for my money Austin in Mid March and Indio in late April are definitely two of them.
But to each their own, if the pricing seems exploitative from your perspective and you decide not to attend, while I'm sure we'll have a poorer experience without your presence we'll try to soldier on anyway.