Ha! Just think for a moment, and I bet you can come up with a few common kitchen appliance I missed- like, say, the bread machine and the waffle maker!
A common "combo" might be using the Foreman grill on a burger while the rice cooker works on the red beans & rice. Now, there's a nice, quick meal for the single guy. Will you pop the breaker? Well, look at the table ....
At the other extreme, there's always the house full of teens rushing around as they get ready for school. I bet someone has seen a hair dryer laying on the kitchen counter ...
Nor can I forget my favorite- the SRO fleabag "residence hotel' where they think that a compact fridge with a micro sitting atop it, next to the bed ... and the bathroom sink nearby, make the room a "kitchenette." Hmm.... does that mean the bath circuit is also an SABC?
Big stoves are nice, but it seems the folk who want the stoves also want enough counter space you could land a fighter jet on the kitchen island. With all that space to fill ... well, I suppose that explains the demand for an endless variety of appliances.
Speaking of which ... just in from a road trip, and the hotel had a new gizmo in the 'breakfast bar.' They had an AUTOMATED pancake maker. Push button, wait a bit, and two flapjacks drop out the side.
http://www.engadget.com/2009/08/07/chefstack-automatic-pancake-machine-for-all-your-pancake-part/