Inquiry for a $20 Tier? (Patreon)

Recently I've been getting some more people interested in the $15 tier, but they're sold out because tbh I would actually overwork myself if I just let that number pile up unchecked. I mean, imagine me drawing at least almost 10 drawings/month? I mean that'd be great for you guys but not so good for me. 

So I'm considering opening a $20 tier, that'll effectively have the same rewards as the $15, but with some minor added benefits. I'm not too sure what that benefit is going to be, but if I'm going to accept more requests, I want to make sure I'm also being compensated for the extra work.

What do you guys think?

Below: Examples of my Patreon sketches that has been made available on Twitter