I emailed Heather in the offer letter and she forwarded it to two other people. I mentioned two competing offers at comparable schools, and said that I really wanted to go but the stipend was making it hard for me. Fred (one of the people, I think he's the admissions chair) responded to me almost immediately with the no.
Yep, the same for me (literally point for point). Oh well, not sure at this point whether it's worth going for the fly out.