Just showing really how expensive daily passes are in comparison to a season pass, so you have to lock it in despite the chance that your life circumstances or season conditions may change. So new spur-of-the-moment I-discovered-skiing-for-the-first-time in January folks are going to be hurting in the wallet.
The point of the raising the pass suggestion is to accept the reality that the corporation needs to make up some of the lost revenue. People who can afford the pass can afford to pay a bit more and still probably be nearly as happy, while lowering the day passes will greatly increase the new customer base happiness.
I do think that day pass prices are too high, but I don't know that I agree with your assumption. A lot of people who know they're going to get at least five days are locals. And a lot of them really benefit from cheap pass prices -- especially passes with blackout dates -- and might not be able to afford them otherwise. I suppose they could do further price discrimination by creating "locals" options that required proof of residence, like a utility bill, at a discount off the general season pass prices.
I know that a few years ago, at least Snowbird had a 10-pack.