I actually pmed him this morning. To answer your question, the reason why somebody is selling a fish/turtle etc. can make a big difference as to whether or not a buyer is able to take care of it.
Perhaps the turtle doesnt get along with other turtles? Maybe the turtle was injuried or sickly? Maybe he just wants some Xmas money or needs more room? Maybe the turtle is not fish friendly? (not that most turtle are)etc.
Another question to ask is what does "eats good" mean? Are we talking feeders? Pellets? etc.?
My point is that the reason why a seller is sellingsomething can sometimes give you an idea about the fish/pet you are buying, such as previous housing conditions, tempermant, etc...