Why are the incentives for each provider to drive engagement? If I host a small server in the Fediverse, maybe I don't want/need engagement but happy users who

Why are the incentives for each provider to drive engagement? If I host a small server in the Fediverse, maybe I don't want/need engagement but happy users who appreciate a healthy community and are willing to pay a dollar a month to keep it running. I can compete with other providers, but I don't need to out-compete them.