Too good to be true?

When it's too good to be true, 99% of the time it is. But I see these brand new 99-04 busa's R6's Gixxers, Cbr's etc going for 2-4k. And usually when you see one in an adlist the bs flag goes up. But I always see a good amount of them from all over. Would it be safe to look into one and get some details or just avoid it like the plague?