It’s very, very expensive. The state constitution guarantees a right to an education. While it’s possible to deny someone that right based on poor behavior (like many other rights), it’s a big deal.

If you mean does an expelled student mean reduced funding … I don’t know. Maybe nobody knows. It hasn’t happened in decades.

When a student is suspended there’s usually some provision made for their education: individual learning.

The district is still doing something for them.

With expulsion, it’s as though the student is a non resident for purposes of registration. I don’t know if that applies to funding.