That doesn't sound 'bad', except for the salvage title, part.
I think a lot depends on the state, but some of the requirements for salvage titles vary quite a bit.
The bike could be pieced together from a bunch of wrecked bikes, or stolen, and recovered, as they suggest.
I'd at least pay for an INDEPENDENT (Not associated with the seller) motorcycle mechanic to look at it before you buy it, or at least a buddy who knows a lot about bikes.
IF you can get the VIN number of the bike, it's also possible to trace the vehicle. This costs $12-15 and you can do it online.
This may not tell you much, either, but it can fill in some gaps.
I bid on a used bike on ebay, traced the title, and while it didn't tell me much, it sure didn't jive with what the seller was telling me!
(The bike hadn't been registered in years, although his teenage kid had been riding it in the rural area he lived in the whole time. The bike looked like hell....)
I'd be careful, and maybe offer quite a bit less.
Oh yeah, I'm guessing you can pick up a Bandit 600 of that year with a normal title for around the same money..