Exactly... BTW, the Croatian IMFC did an interview with Dave Beazley, better known as Dave Lights, who handled Maiden's light show up until Somewhere on Tour. Since then, he has worked with Prince, Madonna, Dio, and he was the one who arranged the light show for New Year's eve 2000 in Greenwich, so he can be considered quite an authority on the subject. He said that he, still today, controls his light show manually, doesn't believe in pre-programmed stuff because, as he said, it can never be as precise and "human".
What I'm saying is that if Maiden's light show was controlled manually, they could play whatever the hell they wanted, every night a different set - if they wanted to. But I think that they simply aren't willing to. Why, I don't know. Hell, even the Rolling Stones, now in their late 60s, play different sets each night, they're an even better example as opposed to Dream Theater who don't have such an elaborate stage show.
Imagine what a treat it would be to collect Maiden bootlegs if each show had a slightly altered setlist, instead of the same songs and same speeches at the same spots...