Should I add more tiers & perks? (Patreon)

Hello good people.

I was curious if you think I should be adding more Tiers,  
I thought about it, however I just cannot think of any decent perks for them.

I don't want to rework the current perks system too much, I have no doubt people wouldn't want their benefices changed or removed.

So I'm curious what you think.
Should I add more Perks?  If so, please make suggestions below