I'd also say it's disappointing, and would have hoped/expected 1,000+ would travel.
That said there's a small amount of mitigation in that Gillingham is not as close a trip as people imagine, it's a horrible drive right round the M25, so journey time is probably similar to one of the northern teams. Also, when you get there it's a pretty s**t day out, a lack of decent pubs, parking is difficult, and then there's the scaffolding. Added to that the fact that no sales on the day are available, and I think each one of those things has a small effect that makes the difference between 1,000 and the 750 that we're likely to end up taking. We've also played them a lot, so there's no novelty factor.
As I say, poor, but there are reasons that partly explain it.