Ashworth averaged 16.2/4.5/3.3 on a 65.8% TS%.
Hall averaged 9.0/5.1/3.5 on 54.2% TS%.
Now Hall played in a better league and plays better defense, but those numbers from a scoring and efficiency standpoint are not close.
But you are worth what someone is willing to pay you, so if they say $400k then he is worth $400k.