Plus Qt isn't free, if I'm not mistaken.
That said, the cost really is extreme. So much so that there is an ongoing effort to remove Qt from our products entirely. There is general agreement among the devs that the cost is not justified by the benefits, and nobody can remember why it was chosen in the first place.
All that said, I like Qt. It's quite capable and you can produce decent, portable UIs with it. But I agree it's too expensive to justify.
Looking at the rest of the comments I see that Qt core is free, but the rest of it isn't.