Even if you ignore the accusations or corruption or UEFA's "hidden agenda" against City, our fans have a complicated relationship with the Champions' League, to the point where I think most of us would consider it third or even fourth priority at the start of the season.
Let me explain. When you're not in the competition and you're looking up at the teams who are, you feel envious. You want the big European nights under the floodlights in April and May, you want your own Liverpool in Istanbul, your own United in Barcelona. It's a tournament drenched in legend and prestige, a place where the world's best players get together to play dream team football and win the ultimate prize. You want nothing more than to get there and join in with the big boys. When we played Napoli back in 2011 and the anthem rang around the stadium you could really feel everyone's blood running round their bodies just that little bit quicker.
But then you start getting used to it as a fanbase while the club doesn't quite adjust. There's no beer on sale inside the ground, your players are still too naive and fall onto the referee's bad side, and you're not sat around your Saturday 3pm regulars. As matchday experiences go, Champions' League ones are the worst. On the pitch, you're trying to make your way in the tournament and get a foothold to climb into Europe's elite, but you've been drawn against Bayern Munich in the group stages again, which means you'll likely be facing Barcelona in the first knock-out round. Great, that's what this tournament is all about, surely? Well, yes, but facing Barcelona in the knockout round means your seat that's worth £35 for a game against West Ham is suddenly £50+ on a winter weeknight.
You have occasional good nights. You beat Bayern Munich 3-2 with a big last minute goal, you beat PSG to reach the semi-finals, you finally beat Barcelona in a big game. But it's not enough to combat the disinterest and apathy, the feeling of the corporate elite invading your space that comes with larger advertising hoardings and more expensive tickets. And what chance do we have of winning it anyway? So you stop paying for three group games and any subsequent knockout ties, and you watch it at home on TV instead. Why rush home from work to watch a game against Lyon when you can go at a leisurely pace and sit on your couch instead?
If even 5,000-10,000 City fans feel this way, that affects attendances significantly. We have a core, local support of around 45,000-50,000. The rest come and go. As some posters have recognised in this thread, City aren't a team you want to travel from far and wide to come and watch. Not yet. It'll come with time and continued success, but it won't happen overnight. We can't make up the numbers with day trippers and tourists yet. We don't have a mass global fanbase to draw from and two decades worth of trophies to back it up. So every now and again, especially in cup games, our attendance will drop under 40,000 if even 5-10% of the regulars either can't part with the cash, can't be arsed, or were priced out years ago with the steady increases.
I'm not sure why attendances are so important to fans of rival teams when the reasons behind them are pretty boring and self-explanatory?