As to spread between A's and B'sJust my 2 cents
There is no difference other than the 10-1 voting rights that the A's have over the B's..
So in my view, on a pro rata basis, there is much more demand for the a's than the B's and since the only difference is the voting rights there must be some contentious voting to be taken some time in the future to have people pay such a premium for something that in all essence is worth the same.
After the conclusion of that vote, either the A's go back to near the B's or the B's climb up to where the A's will be.
People have historically only paid a tiny percentage more for the A's than the B's so why people would want to hold onto the A's when they could buy near twice the b's just tells me that those voting rights do mean something big at this point.
IMO not much more complicated than that other than what that vote will be about ?