Actually Luke, that's not true. They currently pull in $125,00 per episode - most sitcom actors make much more than that on US shows that are half as successful as the Simpsons and many actors on popular long running shows like the cast of Friends or Ray Romano make $1 million per episode or more.
I think they're being fair. The cast's contracts expired several months ago and they had been working without one so they're not walking out in the middle of their deal like a lot of TV stars do - they are in legal strike position it seems. They only made $30,000 per episode until the last time they walked off the set in 1998 which is close to minimum wage for the star of a TV series. You have to remember that actor's salaries are based on how much money they generate for a company and the Simpsons is a series that Fox has made hundreds of millions off of.
Unless Fox decides to replace them I'd guess they'll settle for something like $200 - $250 thousand per episode.