Well this needs to be changed. Congress should not have the ability to vote themselves salary increases, or to vote on the rules of their own tenure.
When did you get to vote yourself a salary or how long you could stay in your job?
Hasn't happened yet; I doubt that it will, unless I run for congress and win. But I don't expect that to happen, either.
It shouldn't happen with congress critters, either, but their bosses don't appear to care.