If you don't agree, then what is a better source to go by?
I dont know, and I don't really care. You stated your opinion that you think iLife is a major selling point for college students, I think it's something else. Unless either of us care to look for some poll statistics (which themselves have to be taken with a grain of salt), then they remain just that: opinions. I do not consider personal attestations "facts" more than I would consider a single data point indicating a "trend."
I'm perfectly content to give my opinion and leave it as such. I guess I agree that "some" of the appeal is due to iLife, but what does "some" mean? 1%, 5%, 95% ? Shrug. Wow, we're way off topic, so I'll just leave it at that.
As far as why Apple doesn't convert the major apps; it's all about locking in the customer to the hardware. If they make their Pro software available on windows, they lose out on the advantage of uniqueness. Several people have stated this already.