Yeah, I'm going to agree with Colin. Even if you could get an antivenom going, the market is so limited the funding wouldn't be there for production. Aside from that, the bacteria David mentioned is an aspect that must be delt with as well. The hot water flush gets a good jump on both issues.
One other fun thing to do is once you get tagged, cut the wound open to make sure there isn't any remaining barb fragments left in you.
Nic, there are cases of death. Usually, they are smaller kids who take large amounts of the toxin, or people who have jeopardized health to start with.