A: There is no set formula for this, but there are a few things you can look for. The first thing is in
which division you are playing. Obviously the first div means you can have a really big stadium and still
fill it on most occasions. The second thing to watch for is your clubs rating and ratings of those clubs
that you'll be playing against (the higher the ratings the more spectators will show up). And the last thing
is how many people are coming to watch your games now. If your stadium is full all the time then of course
you should expand it. If it's not then I would have to say it's better to leave it the size it is (or maybe
check your ticket price).