My marginal utility for computers seems to drop after three. Once I have one with a big screen, one I can use in bed, and one I can carry around, a fourth one seems like a fun toy, but not much more. Seven is probably getting into negative utility :->
(Unless, of course, you count the XBox, PS3, and Wii, and the Virgin box, and the router, and the one inside the washing machine.)
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(Unless, of course, you count the XBox, PS3, and Wii, and the Virgin box, and the router, and the one inside the washing machine.)