The capacity is 40k, so they could sell a lot, but the problem is to sell more and more. We may observe the same tendencies in many other cities on tour. It looks like people aren't interested in participating in Maiden shows. Maybe some people are right, the era of band's stadium shows is over? As I calculate, all the shows they announced so far could hold some 1,9 mln people. If the trend won't change, they will sell not more than 65% of that amount. It would be poor.
I'm almost sure the scenario will be the same for Central America shows, and probably the rest of the world dates too. Rod should be really proud of himself