I recently dropped:
Of those, the only one I'm reading is Supergirl, although Books of Magic is a comic I'll probably take a look at in trades. (Which wouldn't be the case for Harry Potter. But I'm sure JK Rowling doesn't need me.)
Catwoman and JLO I dropped after a couple of issues each. JLO has a new team now, and it interests me...a little, since I like Abnett. I like Jones, too, so Catwoman interests me as well -- but there are only so many branches on my money tree.
As for Marvel, Unlimited handles most of what I want to read there. And I never buy Dynamite books full-price -- they're always available digitally for a dollar sooner or later, and I'm willing to wait for later.