Only issue I have with the hour limit is people will just close the nest and restart to avoid the fee.

How would creators and/or moderators recoup the costs of initiating a nest? Or, would you see it as a means of building community/following for an individual or organization so it would be a cost they would be willing to incur to earn somewhere else?

How about paying larger amount to start but getting refund at the end once time used and number of participants known?

That should cover running costs and be fairest i think.