I've bought both new and used over the years. It really comes down to what you want and what's available used. If you need to be on the latest and greatest, then I guess new is your choice. If you can find what you like in a used bike, then by all means save your cash and let someone else take the depriciation hit. Though there is a bit of a high obtained from riding a shiny new bike off the dealers lot.
My most recent purchase this spring, my BMW F800GS, was brand new. However, it's also a brand new model, so used ones are non-existant yet. If I
don't drop it before the years out, then I'll be suprised (maybe even disappointed).
That's just part of dualsport riding; getting into challenging places where the likelihood of a drop is high. That's why its fitted with a bashplate, crashbars, hand guards and heavy duty aluminum panniers. Those items will help to protect the soft bits when it does drop. My R1100RS on the other hand is less entertaining when dropped, and it has been, but never actually when riding, just tip overs.