Assume it was 1-click and 100% automated to deploy, run and update a Hub.

How much per month would you be willing to pay to run one? 

No direct economic incentive other than you know you're supporting Farcaster decentralization and you have your own copy of the network.

OK, if you're answer is you wouldn't run one.

Working on Farcaster and Warpcast. Longer thoughts at https://dwr.email

If I could run it from home on a Raspberry Pi / Intel NUC / homelab server I already have running 24/7: I would consider it.

If I have to pay a monthly fee to a VPS: quite unlikely.

And that’s from someone who’s run Bitcoin and Ethereum (pre-PoS) nodes for years without economical incentives.