Well you are using tea numbers first of all which no one trusts. But just to simplify it, if your attendance for the week was: M,T,W,Th - 5,000 a day, Fri- 14,500, Saturday - 65,000, Sunday - 14,500 - Your average attendance would be 17,000. They aren't getting 50,000 a day, those are peak days. A peak day at KI or Cedar Point will feel every bit as crowded as MK.
Thats two parks to get what ki does on a peak day. On that same peak day, CP, Canada's wonderland, KBF, all the six flags, etc, are having peak days. Just trying to say, it's not a niche market.