[novariation]

More details: You need practicing, so you need experiments/computers/supplies/projects — this is true both in engineering and art school, any time you do anything that's not completely pen and paper.

You also need to divert time from your researchers to teaching activities. You need to pay for classrooms, that's real estate, plumbing, electricity, etc.

Keeping up with the state of the art in research isn't cheap, and using part of those funds to purely teach and not compete with other countries is an investment that's not neutral.