U2 have always been "hit or miss" with their singles, IMO. Some singles will feature new songs, some feature an alternative version of main song, some feature live songs, some feature cover songs and some feature remixes only. For example, I bet if we could go back to early 1992 and Interference existed then, there would have been an uproar over the "Mysterious Ways" CD as it only had remixes - no live songs, no cover songs, no new songs! The "All I Want Is You" CD featured cover songs and a shortened version of the main song (along with the album version). Would that be enough for fans? Based on what I've read on Interference over the years, probably not - there would still be a good majority complaining about the lack of new material or the live version of the song. "Vertigo" featured a nice mix - new song, cover song, remix. Yet even then fans weren't happy as they didn't really care for the songs. So it's really a no-win situation.
I collect the material still as I enjoy it. But if you don't, then hey, you saved $$. As was already stated, if U2 doesn't do it for you any more, so be it. While I enjoy ATYYCLB when it was released, with the exception of two dreadful songs, I adored HTDAAB and felt it was a vast improvement (again, barring those two songs, which I won't list as I don't want to deviate from topic). But that's me. I imagine if I wasn't as impressed with a few U2 albums, I may feel the same.
Hopefully, though, you suddenly don't feel remorseful about not buying these items when you could and then go back to fill in your collection later. That could be more costly.