They should only be claiming per diem when their colleagues are.  And $200 is too high.  I can see some per diem because they need to participate in events that cost money and probably don't get to eat at home much, but $75 should be more than enough.

The entire per diem rate needs to be reviewed. If legislators can get long-term rentals, then their lodging fees are a lot lower than staying in a hotel every night. Per diem isn't meant to get rich on, only cover reasonable living expenses.  Do state employees make what the legislators make?