for what it's worth, i think that as a practical matter, if you clean them up they should work well. put a light coat of oil on them after cleaning the rust off and you 'll be OK.
having said that, i completely agree that if you plonk down your hard earned, overtaxed, God- entrusted dollars for a new tool, the least you should get is something without surface rust.
just one guy's free opinion, and no doubt worth every penny.