Thinking about something (please read) (Patreon)

So I've been thinking about something. I'm thinking of adding a limit on how many patrons can be on my request tiers. That way if for some reason 20 people want to sign up one month I dont get a million request for that month if you know what i mean. So i'm thinking of limiting how many people can sign up for request tiers and maybe adding new tiers for the same price but they cant request.

That way if someone wants to watch something in that tier but dont want to request anything (its happened) they can just sign up for that tier instead.

What are your thoughts? Good Idea? Bad Idea?