Yeah, I think they can vary greatly. I guess it just depends on what is included in the event. I mean, if it's a three day workshop, and includes room and board, then $1000 doesn't sound bad at all. On the other hand, if it's a half day event, and all you are going to do is stand around the local park and snap a few pictures, then it sounds like the guy is just out to make some money without having to work for it.
About 10 years ago, I went to a couple of local "studio photography" workshops. They two organizers planned it out in great detail. They had arranged for 3 models to be there, and had 3 or 4 different ideas for shoot scenes, including various props. We used their strobes/pocket wizards, and they were very helpful about explaining the lighting setup for each scene. They even had proper model releases for us to use. I believe there were about 10 of us in the class, and they only charged us something like $75 for this whole day class. The money was really just to pay for the models, and the two guys putting it on were basically working for free.