Not really. If you buy the $199 ticket, you can turn it in and get a $199 (plus tax) credit towards the renewal price of the
DVC annual pass. So you will not be saving any money or getting any additional discount to the price members already pay for the DVC renewal.
So the only "advantage" is that you could pay part of the renewal price now and the rest when you get the renewed passes. Keep in mind that all of these types of transactions must be done on site. Will your renewal window fall during a on-site vacation?