Why is Summer Smackdown twice as hard as current Event Quest?

This question is based on Master difficulty.
In the current Event Quest the team rating in Master is around 8000-9000, but in Summer Smackdown it's 17000-18000.
Why????
In the current Event Quest the team rating in Master is around 8000-9000, but in Summer Smackdown it's 17000-18000.
Why????
2
Comments
In master difficulty, 17000-18000 is around the PI of the final EQ boss. A boss rush is exactly what it sounds like.