That sounds kinda high to me, but I'm cheap. I recently replaced the fork seals on one of the streetbikes in the stable. Total cost was about $40 for the fork seals and fork oil. It took me about an hour to do, maybe less and that was taking fairings off and more involved than the TW would be. Check these links and get an idea of what's involved, you may want to tackle it yourself and keep some money in your pocket.