I know it's not much at a fiver, but I don't think I'd bother. I only put clothes in my suitcase, everything like ipods etc is in my hand luggage. It would be annoying to ever lose a suitcase, but I'd just claim on my insurance and get new clothes. You're also relying on the baggage handlers to make the effort of contacting the company, it's not like it is an actual tag that they can pinpoint anywhere in the world. You may as well just put a piece of paper in/on your luggage with a neighbour/family/works address on it for them to contact, it would work the same if you're worried about people knowing you're on holiday.
