I always see interesting threads that are several pages deep by the time I read them. I'm going to comment, without having read pages 2-6.
For the money certainly not. Although I doubt Alan Webb would be making more doing anything else. There's a few others for whom that is true, but they are really one in a million.
So then I would say it's worth it only if you are really driven to pursue a dream. Maybe an Olympic team hopeful. If you're not at the level of realistically training to make an international competition team representing the US, then I would say you would have to get an uncanny level of satisfaction out of just running. You will get a living stipend at best, and probably have to work part time as well.
After college I thought about trying to do the Hanson's program. I broke 30 in the 10k, so I would not have been one of their guys who got all the benefits, but I think they would have let me train with them and maybe I could have improved and gotten some support. There were some stops I still could have pulled out that might have given me another step, but probably only to about high 28 min range in the 10. And that doesn't get you much.
I was worried about what employers would think of doing that for three years instead of beginning my engineering career. Also feeling responsibility to start using the degree that my parents largely paid for. Yeah I was lucky.
In hindsight I don't think they would have disapproved, and I think employers would have understood as well. I've got a lot more insight into industry now. I don't know about taking ten years after college and doing nothing but running, but 3 would be OK. But I don't regret my decision, because I'm still pretty proud of what I did accomplish and running 28:50 would still be a far cry from an Olympic team.
If you really love running and have a big dream, or if you are a lot better than I was, I would encourage you to give hard core running training a couple years after college. See how it goes. If you don't get a whole lot better you should probably think about earning a living and the other good things in life.
It really helps to get with a good training group though. I thought I was tough but I just couldn't do hard interval workouts alone and hit the splits. If you're not good enough to get support, see if a good group will let you train with them and find a way to support yourself.