Frankly, I don't think U2 treats their fans very well at all.
As a comparison, the effort Dream Theater (especially drummer Mike Portnoy) goes to for their fans is simply extraordinary. Some examples:
1. Mike Portnoy has established "Ytsejam Records" to print and distribute high quality 'official bootleg' recordings of concerts, complete with bonus tracks. He has also released collections of demos and out-takes. The quality and depth of this stuff is simply amazing. In comparison, the best U2 seems to be able to do is the "unreleased and rare" collection on iTunes, which you couldn't legitimately purchase without buying an entire discography that you likely already own, and you could only get the songs in compressed quality, not high quality uncompressed audio.
2. When Dream Theater records a DVD, they make a point to avoid playing songs that have appeared on previous live releases. For example, the one they shot in April this year will have only four songs that were on the previous DVD. In comparison, Bullet The Blue Sky and Streets have been on every single U2 live video/DVD since Rattle And Hum, WOWY has been on five videos in a row, One has been excluded from only one out of five videos released since its live debut, et cetera.
3. Dream Theater goes to great effort to play varied setlists. It's one thing to play something different to the night before. It's quite something else to retain a record of all the sets you've played in a particular city and make a setlist different to those previously played in that city. Think about it: a typical fan of a band lives in their home city and sees them there rather than travelling. So Dream Theater tries to give them a different show each time they pass through that city. In comparison, U2 typically plays the same core hits even if they've already played them 20 times in that city before. All that significantly changes from tour to tour is the new material.
4. The members of Dream Theater actually interact on their fan forums and have a say in their websites. I have to wonder if U2 are even aware of the wild inaccuracies that have appeared on U2.com.