Because they have 500k salary doesn't necessarily mean they're "stupidly overtrained".
Right. If the team that trained the player can afford a player like that in a roster of players of similar skill levels (and, therefore, salaries) and not bleed off money like a geyser, then sure, it can be a well-trained player. (Though, of course, I'd still be willing to bet that at least 80% of those guys are ones with either passing or handling no higher than inept). If the team that trained that player can't afford him, and no other team can afford them within the context of a non-farm team for any significant length of time, then they are absolutely stupidly overtrained.