There’s no real conversion rate of points to dollars since the point redemptions are based off many things not just cost. A trip up the west coast may be a different amount of points then the same fare on the east coast. With that being said that’s a nice chunk of points!
Sent from my iPhone...
Not being able to purchase points is definitely a cookie problem. Once you've enabled cookies (you may need to also clear old cookies) you should be all set.