It's a mystery. Most 5000-level players don't know about the Hermit/Market Square megaturn. They also open with Pirate Ship in response to your Chapel.
I wouldn't know how to execute hermit/market square and I'm well over 6k. Reading long articles is like tedious work!
Eevee! It's not that hard, just open Hermit/Hermit, gain lots of Hermits and Market Squares, save at least one Estate or non-Treasure trashable card, and slowly turn Hermits into Madmen such that you have X number of Hermits and X+3 number of Madmen. 6 Madmen and 3 Hermits is ideal, but 5 Madmen and 2 Hermits is also fine.