Aside from Nenechi, I don't really watch the superchat reading parts, so I just try to type something the chuuba is likely to pick up during the streams themselves for that. I find it more fun than paying for them to acknowledge me, but then again I don't stick for SC readings even when I send supa, so how would I know.
I mostly try to send supa to add to the stream, though. Like when Nene is doing superchat readings and the subject calls for it, I'll send something she can turn into some dumb drawing to get clipped and in turn get more people interested in her. If it's just about sending them money, they'd get more from just rebuying the same voice pack over and over again, so try to turn your supa into something else, even if it's as simple as adding one more to some bandwagoning superchat moment, because the more that are added, the more people will want to join in, more than making up for the youtube cut.
I don't even know if I had a point, I'm not gonna read this whole post again to make sure.