Cos they were first leg games. That's why they didn't have great attendances, at the end of the first leg game unless you beat thrash someone you haven't got to Wembley yet, the reason why a couple of Everton mates didn't go to Goodison , but are going to the etihad on weds.
2Nd leg games always generate more interest cos it's like a final in itself to get to Wembley.
Unless if it's a derby against utd , which we sold out.
If we had played Liverpool or west ham at home in the 2nd legs, and the first legs had been close, you can bet your life they would have been better attendances, infact I think the Liverpool game would have sold out, maybe not west ham.