Although cheap kitchen timers can be as cheap as just a few dollars, a premium one that you can use hands free might justify a $50 price tag. That was the only remotely useful use-case that I could find in this article, but maybe that’s enough.
The larger question would be, out of the tens of millions of people who purchased a smart speaker, how many people hooked it up to a smart home device e.g. smart light bulbs, smart locks? Assuming that this is what is going to be hot at CES, I wonder how large the addressable market actually is, which I expect is probably much much smaller than the total number of devices sold.