1) The course is fast.
2) It's later in the year allowing for more preparation(two months later).
3) It's in North America so jet lag and bad English food isn't an issue.
4) Money shmoney...these guys are trying to get the 'A' standard for Athens. If you can get a good pack like they had at Chicago, gunning for 2:12, anything's possible at Grandma's. Ask Beardsley.
5) Boston is only big in the minds of Bostonians and John Hancock now. They've gotta get over themselves.
6) Grandma's is also point-to-point like Boston and they had a ridiculous tailwind last year.