That, too. But it's also much easier to sell plants that look the right color to people perusing them. Ever see a commercial or resale garden center using fuchsia-tinted grow lights? No? That's because they're out of business.
But I know of plenty of commercial greenhouses that use them prior to shipping to retail.
In a way, you might say that until now, LED grow lighting was only feasible on a very very large scale, or a very small scale, and the medium-sized local nurseries and greenhouses were just out of luck. Cree seems to have changed that.