I can't imagine a Coldplay tribute with people singing the songs. Why in the world would i want to hear somebody else singing Coldplay songs?
There was a U2 tribute album where all the songs were done on piano and there was no singing. This was pretty cool and I can understand the appeal of that. I don't see the appeal of a Coldplay coverband.
BTW, the Coldplay tribute album sucks. I just listened to it on Itunes. Worthless.
Who cares if one show is like the others? Chances are, you aren't following them around from show to show. If you go see them and enjoyed it, who gives a crap if the next show, 500 miles away is similiar?