THAT. IS. IT! (caps for emphasis).
One district had an MBU on the same weekend for decades. Well organized, experts for MBCs, etc. However council was not making any money off of it. They created their own, the same exact weekend, but at a much higher price. Original group followed NCAC, and raised costs a bit so the council could make $1/person profit. You think council would be happy?
Council cancelled the event one month before it was to occur, and after the registration deadline to their MBU.
A lot of these issues are caused by councils not planning MB events far enough out in advance using MB classes / events as profit centers
Fixed it for you
I was never asked back to one MBC because I sent a pre-requisites list, which didn't get sent, and didn't give away MBs.
If it is a MBC with council affiliations, no. If it is a museum doing their own thing, doubtful.
Sidenote, I ran an Indian Lore MB day as an OA fundraiser/promotions/equipment maker event. Yes, we charged at the time a steep amount, $35 in the early 2000s, but that included craft supplies, and lunch. Folks knew they would not be able to complete the MB in advance, unless they did the prerequisites. And guess what THE SCOUTS HAD FUN (emphasis), new OA chapter got publicity, and we got enough money to get some ceremonial regalia. My point is, if you make it fun, and let Scouts know in advance, they will still come.