No, why would it? You can even pay on the day anyway. The away leg will sell out. So it has now impact.
Well I was just wondering because I have been down this morning for mine, obviousley unaware it was closed, and there were others there who were not happy.
What would affect the attendance, should we be in a position to sell out, is that there would be many season ticket holders seats that would be empty as they choose to pick different seats to be with their non season ticket holding friend / family etc. With these season ticket seats not getting onto general sale at all, this would leave large gaps. However, I don't think that it would make any difference as we won't sell out anyway.