I did a trade-in and what was more important than the actual price paid for the GT was the price to change (the difference between trade-in offer and the cost of the new bike). I got a trade-in value well over book (because of the relatively low mileage), plus a very, very, good deal on a full BMW riding suit & inners. You have to ask, but deals can be had.
The main reason it is difficult in some areas (at least in the UK) to get a really fantastic deal is that currently my dealer can sell every GT he can get hold of - I think he has sold about 10 since they first came out in April. However, even if the bike had been slightly cheaper from other dealers in the area, I would still have gone to the dealer I did, because his service, both pre & post sales, is just superb. That's worth more to me than actual cost (that's not to say I don't put a bit of pressure on if the price difference is big).