To do a search of completed e-bay sales, you must be signed in. Enter search criteria (in this case, Bernina 160). Scroll down to "Show only" on left; click on "completed listings."
A 160 was sold on July 17 for $461 plus $50 shipping. It's the only one that has sold. Very few Virtuosas are listed at all, as you will see if you do a search yourself. My guess is that most people would sell them through a dealer, probably as part of a trade-up, to get the most for them. Of course, selling that way you are then spending lots more, lol!