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Seems to be.

IgniteUI ($1495 per developer)

I also know:

Webix ($469 per developer)

dhtmlx ($466 per project)

ExtJS ($895 per 5 developers)

Kendo UI ($999 per developer)

Anyone knows other alternatives?

I'm really interested to know, who are the customers for such a product?

Well, people who want more sophisticated UI elements than HTML gives them, but don't wanna implement them themselves?

Looks really nice and based on React.

ExtJS is $895 per developer with a minimum order of 5 licenses.

ah, okay.

They got rather strange pricing lately.

Back in the 4.0 days it was like ~$400 for one dev, without support.