But, I would not really have an issue with there being laptops that don't have them if it weren't for the fact that it has become a near universal trait of laptops, even when there's plenty of bezel to accommodate them.
Some of us do use those keys, and having that option would be nice.
Not having a numpad means my keyboard takes up significantly less space on my desk and means mousing is more ergonomic; not having one on my laptop makes it much prettier and lets me have nice speaker grills.
I suspect that this is true of the vast majority of people, except maybe accountants, data entry folks, and some scientists. But I generally do finance, math, and programming just fine without a numpad.
IP addresses 127.192.168.00.1
You can enter many calculations quickly: 327.5 / 15.3 * 7
[enter] also means you can add type in a column on numbers quickly which is useful for setting up spreadsheets or depending on software time sheets etc. Teachers often enter lot's of grades at the same time etc etc.
The downside is wider keyboard. But, you can just use a separate USB device.
http://www.amazon.com/V7-Ergonomic-Resistant-Notebook-KP0N1-...