I've read this thing about 10 times now and what I think is happening is they're lowering the buy in threshold to reflect the "free" points.Technically it's a 155pt contract, right? Is it even possible to buy exactly 150-154 points right now?
EDIT: reading DVC's promo site, it's a discount that is the value of points. Not 5 free points on top of whatever you buy (which they did back when we bought our first contract...buy 200, get 20 for free, so we ended up with 220).
Instead of the math being buy 200, get 10 free, the math is pay for 190 and 10 of them are free which brings the contract up to 200. It's the front end of the math that changes (190 x base instead of 200 x base). That's where the lower up-front cost comes into play.