You do realize that this show will have like 40-50K attendance and that she has 4 other stadiums in Great Britain and 2 festival shows? That's like at least 200K people seeing her live in GB.
She played to 90k in London last time, I think that is why people are surprised its empty.
The pop girls can't even compare to the likes of Coldplay, Bruce Springsteen, Rolling Stones, U2 and Paul McCartney.
the rolling stones played many half stadiums. the only real successful band that sells out stadiums with ease are U2 and ACDC. bon jovi is not doing well either. springsteen is sometimes full, sometimes almost. but not like other bands.
London will do better than Dublin for sure, probably will gross more than Amsterdam as well, so it's not the worst date. Dublin looked better because they moved everyone down, if they did that tonight it would have looked much better rather than people being scattered towards the back, that's all.