Most motorcycles don't hold there values that well. Comparing the LT to the Goldwing, the Goldwing has much better resale value, and they have a lower MSRP.
The LT doesn't hold it's value I think for the following reasons -
1) It's still relatively new in the US, and it's not known whether BMW will even come out with a new model, plus it doesn't have the name that a Goldwing has.
2) BMW dealears are few and far between, where Honda dealers are all over the place.
3) BMW doesn't focus as hard on there motorcycles as Honda. Honda started out making motorcycles and never forgot their history.
4) There are quality problems on these bikes that you will never see on the Goldwing. I'm a huge BMW fan and I think they make great motorcycles, but sometimes I think they just don't put the same effort as they do in there cars.
Some examples of #4 -
They still continue to use the diconnects on the fuel line that are known to leak. It's not a big deal to change, but something like a $3 diconnect can disable your bike on a road trip. BMW should have recalled the disconnect and use something of higher quality.
The throttle cables get stiff and break - this went on 1999-2003. 4 years! Throttle cables are not exactly difficult to engineer, how could they have messed it up and let it go on for 4 years? I don't think Honda would have neglected that.
Final drive failures on most of their models? Even 4% is high. I know the older ones are more likely to fail, but you still here of 2008's failing from time to time. It should not take almost a decade to make a better final drive.
I love my LT and would buy another one in a second because they're great bikes, but they require a little more TLC. I'm ok with that, it annoys me, but I'm ok with it! I think that extra TLC is reflected in the resale value.