Being quite a huge fan of the series, this is probably the worst news I've heard in ages. It came as a huge shock because I distinctly remember during the numerous commentaries I've watched the voice actors claiming that they loved the show and it was one of the best shows they'd worked on, or at least they acted that way. If this whole salary thing is the issue then they couldn't have loved the show that much.

*sigh*

I was very excited for a 6th season. Not so much anymore. We'll see though I spose. It may not turn out as bad as everyone thinks. Although, apparently only a few of the writing staff returned too. That kind of crushes my hope even more.
Time will tell....