I like to know everything... most of all the setlist cause I want to know what the opening song will be, what songs to get excited for, what songs she'll remix so I know how to enjoy them, but more than anything I always want to know when to expect the finale and when to like.. prepare myself for it. I don't really like that feeling at concerts where after like the first hour you're always like 'is this the last song?... Is this the end part?... Oh maybe this is the last song?', it just puts my mind a little more at ease and it makes it more enjoyable to know when the end is coming.
It doesn't ruin it for me, I didn't see the CDT until towards the end of the tour and I'd been following it since the first show so by that time I knew the whole show backwards (yet somehow it was still EVEN better than I thought it would be), I think it only made it better!