everyday stuff with elves

I don't understand though. Why would Elves need servants or butlers? Since, of course, they have all the time they need, and, why would a being so kind-hearted want to put someone to work. And, actually, throughout all the books I've read, I've never actually seen something saying : "And so the elf worked for silver pennies". Elves didn't go by money. They never worked for it and never payed it. So then, unless if it were an elf taking care of another, elves would most likely be self-served.