1) I think compilations make a great starting point for newcomers.
2) If you just want 1 great song from a show that's represented in a comp, you wouldn't need to download the rest of that show. (Unless, of course, we adopt individual song links

3) On the flip side, you might hear a great version from a comp and later decide to download the rest of that show.
4) They help people collect various "best" song versions and tour rarities all in one shot.
5) They're legal (obviously a prerequisite for U2Start
