They are overkill tho, and i think having the ENTIRE thing covered in rubber makes people lazy, then expecting the whole thing to stick like glue. Plus with just the battery pack being soft rubber, none of the buttons are in an awkward position and heavily recessed. Just my 2cents worth.
BTW to cover your $2 estimate for the rubber grip, Nintendo could just hide the cost in 2 first-party games and increase their price by $1 each
(Yes I realise I should be working for Nintendo)...
BTW, anyone else think the D-pad is about 5mm too far to the top of the controller?