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We want to give one because it makes us happy that we can make our partner happy. If you care about someone, it's pretty nice to know that you can please them in a sexual way. Plus, hand-jobs are a lot less work then blow-jobs, so it's not a bad thing to have an easier and less tiring way to do it.
"...one of the strongest motives that lead men to art and science is escape from everyday life with its painful crudity and hopeless dreariness, from the fetters of one's own ever-shifting desires. A finely tempered nature longs to escape from the personal life into the world of objective perception and thought."