All I know is Loveland is generally around $60 a day peak season. So if you go six times a $350 season pass is worth it. Still, you do get some money off with the Loveland card and some free days. So that might be worth it to you to just pay as you go.
Back in the day, I would get the Loveland card and it was a pretty good deal. Season passes at Loveland were also $800 then too though...