Once you start using keyboard sizes below 75% or so, getting a fully programmable keyboard is essential, IMO. I've programmed similar layouts on all my 40% keyboards, so I rarely run into issues when I switch from one keyboard to another. As for the "why", it's nice to not have to move your fingers from the home row to type numbers and symbols (and it's fun to confuse people with my tiny keyboard)
I believe it. :P. I just like the old fogey versus hipster dynamic between guys like me who prefer a 122 key board versus guys like you who use 11 keys and mind control.
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