... But the reward of a successful collaboration is a
thing that cannot be produced by either of the parties working alone.
It is akin to the benefits of sex with a partner, as opposed to
masturbation.  The latter is fun, but you show me anyone who has gotten
a baby from playing with him or herself, and I'll show you an ugly
baby, with just a whole bunch of knuckles.
		-- Harlan Ellison