Who paid £60m for Gordon? that's just paper talk.
Grealish was ridiculously over priced too but even at that he was one of the best midfielders in the league the season prior and by far the best player at his club. Elliot is neither of those things.
Anthony and Sancho are different, star players at their respective clubs. High profile forwards always cost more than midfielders.
Again I'm not saying we should be looking to sell Elliot, but if someone was mad enough to offer £50m for him we'd accept it in an instant.