I've never sent anything in for repair so I don't know if it is fair. But if you think something will need fixing and require the $100/hr fee you might consider that you can buy a brand new pair for about $320+shipping from boxy. With shipping and import fees it will probably be around $400 for a pair. That $100/hr can add up quickly and with a new pair they will be under warranty for a while.
Stay Kind,
Dana