I have been told that a Salvage Title was for both buyer and sellers protection.
Buyer is alerted to the fact that the vehicle has had damage and been repaired at some point.
(Just so you are aware it has had it's problems, and may have more)
Seller is relieved of any responsibility should these repairs fail, or other complications develop due to the damage or repairs.
(Buyer can't bring it back and say they weren't aware of any potential problems related to the repairs)
With a Salvage Title, it is truly "Buyer Beware", but you can save a bunch of $$, usually.