I have a couple of supporters who have given me ink over my time since I unlocked that feature, but not many of them. I have one person who regularly comes back to drop me a couple hundred ink and I think that's amazing they love my book enough to do that. But that's okay. When I got enough of a following to unlock support I didn't expect anyone to support me and I have 10 people who have, so no complaints here!
I don't have any other sites that allow people to support me because I've just never felt like it would be worth it. And now that I've been on a bit of a hiatus to focus on myself for a bit I'm definitely sure there's not enough people for me to open anything outside of what I'm getting on Tapas LOL