Definitely have to be careful. Awhile back when Morphey's was auctioning off the remainder of Larry Ruth's collection I bid and won a wooden WRA ammo crate. My winning bid was $35 and I was really thinking I got a great deal but with shipping, an additional handling fee, tax and premium I ended up paying $120 +.
After that I was happy I didn't "win" anything that went for big bucks. Lesson learned.