Just because people don't race there, doesn't mean it doesn't get used/abused and isn't in need of repair. There's mobs of people (read kids, but whatever) who ride there every weekend. There's a bunch of us to ride there all the time during the week too. The big rain before last weekend, there was tire tracks in the mud as deep as my finger all the way down the track and one scooter (we think, or a roadie or a keen kid with a stick) track all the way down too.
edit: There's not actually any signage at the track that it'll be closed at all. Not that unusual, the bmx folks never have things posted there-they sure bitch at people for not knowing things tho.
The mtb side is the worst i've ever seen it, been going there for like 3 years now. Some of the ruts are as wide as my hand is long. I've emailed Syd Olympic Park about it, hopefully they'll do something. Who cares if it's not racing, we have fun riding there and isn't that the point of riding bikes ??