Couple of comments:
1. As noted by @farnorthtrader, sometimes it is possible to buy Aeroplan points for less than 1.25 cents, essentially getting a discount on prepaid travel. Discount is not huge, especially if you factor in the opportunity cost of parking money in points when even the no-risk return rate was around 5% last year. Also, Aeroplan sells point in CAD while pay yourself back is in USD, so this will keep working as long as the exchange rate doesn't go back too much.
2. With the current transfer bonus (20% + 10% if moving at least 50k points), direct redemption value of Ultimate Rewards points becomes 1.3*1.25=1.625 cents (up to the max amount). Why would anyone want to use them at 1.5 cents and deal with the extra layer of buying through Chase Travel (which is handled by Expedia, with their "computer says no" customer service).