Kudos to Metrolinx -- I was dreaming for a longshot $15 with a realistically expected $29.
$10 for airport employees. That's actually reasonably attractive considering you will spend pretty much almost that much in gasoline average daily, if you're driving a SUV all the way from downtown in daily gridlock (Well....at least before gas prices fell!)
Understandably very expensive compared to TTC or GoTrains, but now competitive for a pair/couple catching a taxi versus the UPX. This number is not too far off the mark. They must have fought long and hard, a big Presto discount is extremely clever. It allows them to profit from tourists (Who likely won't have bought a Presto card), while satisfying commuters. At this price and a flight to catch, downtowners (including couples) such as Financial District businesspeople, and "condo boom" residents, will be taking this instead of anything else going to Pearson. And the tourists will flock to it, being cheaper and faster than taxi for a travelling couple. The trains (much shorter than GoTrains and subway trains) will mostly fill, no problem.
The prices won't make everyone happy....
...but it assures that these trains will be very popular.