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.

People saying $30 is bonkers to me with no incentive. I'd pay around $5/month?

I care about a lot of projects, so paying double digits per project would quickly get hella expensive.

If they were $30/month, I'd see if there was a way to sponsor one.