The thing is half of the JT is considered deep cut/rare. A lot of people are forgetting that
I hardly call them playing a song that sold 25,000,000 copies - and is in the top 50 selling records of all time - a "deep cut" by any stretch.
But they are. Most casuals aren't going to know the words to those songs. Achtung baby sold a lot of copies. Does that mean acrobat and love is blindness are big hits?
It'll certainly be interesting to see! Many will attend simply because it is U2 (in my group of almost 10, most are just fans who've never had the chance to see them; only one really knows JT past the first 4 songs); many will attend because of its being an anniversary tour (perusing the comments on news articles when the tour was first announced, most were fairweather fans, saying that that were going specifically BECAUSE they'd be playing JT in whole); and, many will simply be attending either because their friends are all going (one of my friends in my group fits this mold), or because, in the days leading up to the show, one of their friends will wind up w a spare ticket. The latter happened w a good friend on the 360° tour: my roommate of that time had twister her ankle, and decided that all of the walking (including climbing the stairs to our nosebleed seats) wouldn't be good for her injury, thus freeing up her ticket. My good friend Matt was a bit more than a "fairweather fan", but certainly not dedicated to just jump on tickets otherwise. As soon as my ticket became available, though, he jumped at the opportunity. Long story short, he became a diehard fan because of that show.
All of that aside, I think that it'll largely boil down to U2's performance. I watched the live in Paris video that U2 released w their JT 20th anniversary, and the crowd was super into deep-cuts like Trip Through Your Wires and Exit. To be fair, it was a new release then.
I don't know about now, but I do remember iTunes offering JT for $5 after the tour was announced; I assume that Amazon did something similar. With that said, hopefully album sales have picked up such where songs 6-11 will be more recognized!