Such cards usually have an easy to understand redemption ratio: 100 miles = $ 1 dollar. (credit-land.com)
Reduced bonus, increased spending requirement, removal of the awesome 1:1.6 AA redemption ratio — this is happening now. (lazytravelers.net)
With travel rewards, you never really know how much you're getting because they can always change the redemption ratio at a time when you are not ready to redeem all your points. (highinterestsavings.ca)