I think it was said best above - to each his own. I guess if you really really love the pattern and the fabrics it is worth it. It is a little steep, but I have seen quite a few BOMs out there for that price and even higher. I am doing the Civil War BOM at my LQS and I think that is running me $25 per month, but I love love love it. I don't have a joining fee and my LQS throws in a coupon for a % off of the backing too.
It helps the hit on the pocket book that I don't buy it all at one time. $25 a month I can handle and when I know I have to spend that at my LQS I am less likely to buy other stuff when I go to pick up my BOM.