A little bit. Its kind of a blessing and curse. Theres some really nice stuff I want to find in the TD quarry, but I might not be able to afford it if I did! Doing my own prep work definitely saves some money though.
Edmontosaurus is not a helpless or hapless Dinosaur, It used it's tail defending and faced against an attacking Tyrannosaur with a fatal blow. Both Edmontosaurus Regalis and Edmontosaurus Annectens are the largest of all the Duckbilled Dinosaurs, It could dwarfed It's own Enemy "T Rex".
Thats an awesome question and one I wish I could rattle off an answer for you, but sadly I am not an expert. I rely mostly on the ID from the paleontologist, Walter Stein, who I often dig with.