The bottom line, they live in DC. That’s where their family is, that’s where their friends are, that’s where their entire life is. They have no connection to so their supposed home state. That’s why they never quit. Also, usually their entire family has various forms of bribery jobs that count on them being in office.
Need to force it to be a real citizen legislature, perhaps along the Texas model. It doesn’t eliminate all of the crap, but it cuts way down on it.