I am of the belief that all the programs will change to some type of revenue program eventually. Gone are the days where the airlines fought over your business, whatever it was. Now, they are looking for frequent and profitable business. (It is called a frequent flyer program, not an occasional flyer program). As was mentioned, you may also want to factor in reliability of a carrier. Things have changed a lot over the years and they will likely change a lot more in the coming year or two.