Prices should be low really. A lot of SC holders do not go to CL games and a lot of fans who go to cup games go to the cup games because they can't afford a SC and can't afford inidividual match tickets for Prem games. That's why cup crowds are so different to Prem crowds.
Here are our attendance figures for the CL Group Stage over this decade...
2011:
Napoli 44,026
Villarreal 42,236
Bayern 46,002
Average 44,088
2012:
Dortmund 43,607
Ajax 40,222
Madrid 45,740
Average 43,190
2013:
Bayern 45,021
CSKA 35,000
Plzen 37,742
Average 39,254
2014:
Roma 37,509
CSKA 45,143
Bayern 44,510
Average 42,387
2015:
Juventus 50,363
Sevilla 45,595
Mönchengladbach 41,829
Average 45,929
2016:
Mönchengladbach 30,270
Barcelona 53,340
Celtic 51,297
Average 44,963
2017:
Shakhtar 45,310
Napoli 48,520
Feyenoord 43,548
Average 45,792
2018:
Lyon 40,111
Shakhtar 52,286
Hoffenheim 50,411
Average 47,603
Overall average 44,152
Average in extended Etihad 46,073