If you start to think about it a bit, an electric kettle makes more sense
Not when everyone's got a microwave already, likely doesn't have the counter space for another gadget that they don't use very often.
If you regularly make 1-3 mugs worth of hot water a kettle makes sense. If you regularly boil larger amounts, or don't regularly boil water, the microwave you already own is only slightly slower, so why spend the money?