I mean the conditions have to be perfect. There's a reason it hasn't been hit in 4 years, even by pros.
You have to deal with the local crews who are territorial.
You have to have some damn good jump building expertise and put in at least three full days just to build the jump.
You have to realize that coming up short may very well break your back.
And this is off the top of my head. I'm sure a Brandywine local could give you any even bigger list of reasons.