It's kinda tricky to say, especially given the time of year (end of the current season)...
1. Is it completely stock and standard?
2. Do you have receipts for work/parts, that'd plug the hole in the service history? (realistically, this'll be the one thing that puts off potential buyers).
3. When was it last serviced (what state are the consumables in)?
At this time of year, it's likely to have to be either a bargain (with someone snapping it up and tucking it away for next year) or right on the money, with the bike/history all spotless.
That aside though, the 748R's still a little bit special...
Ignore Parker/Glass guide prices and ask around a few specialists...