Anyone who changes prices a bunch, THAT is a huge red flag. A "Pro" can look at a car and KNOW what's coming to some extent. If I can't look at a car sitting there for restoration and give you a darn good idea of what I will come across while restoring it, I must not have done one in the past right? There are patterns you see when working on cars, very rarely are you caught off guard, unless you are 1. Lying to get the car in the door, or 2. Ignorant to what you will find because you have never been there before.