One-way U fares for ROC-AUA are $237.60. This still makes no sense. I'm guessing he's doing an RT search, but only looking at the outbound flights. The coach flights probably only have full Y for return on the date he is looking, but there may be some discount F inventory (possibly with a different routing). Without looking at the return flight options (upon which the RT fares are based), it's impossible to say.

Also, I see RT X fares available on this route for $430.66. Frankly, none of the above pricing is all that great of a deal that I would advise someone to jump on.