Sorry, I was gabbling a bit. Basically the crowd turns up in (almost) precisely the following ratio: 45% standing, 40% seated, 11% covered, 4% members. The game works out the attendance depending on how popular you are, divides it by those ratios into who sits where, and then if you don't have enough of any individual seat type, those supporters just bugger off.
So your initial stadium has waaaay too much standing room, and not enough of anything else (particularly covered seats, obviously). You've sold out everything but the standing room, but you can use that number to work out what the attendances would have been if you'd had a big enough stadium. You'd have got around an 8,500 attendance at your last match if you'd had room.
Basically, if I were you I'd increase the seated, covered and members areas to something like the numbers in my post + 20% or so to allow for growth (assuming you don't expect to go on a losing spree). But I wouldn't lower the standing room to the "correct" ratio (as the stadium calculator might tell you to do). It's really cheap to maintain, and gives you a very good idea of when's the right time to upgrade.
Is that a bit clearer? I get the impression I'm not explaining it very well.
(also being as new to this as you, I may be giving completely **** advice, so one of the old hands may want to butt in...)
