One comment i have to make..
You don’t need to fly ten long-haul business flights to get a free ticket between two European capitals…
Make them simple to understand, easy to execute and for the love of God, do not change the rules every six months…
http://skift.com/2013/01/23/the-inexorable-decline-of-loyalty-in-travel/
Personal Stories on travelling 
A spot-on short video on the status of Airline Loyalty Schemes – Collecting airmliles
http://www.bbc.com/travel/feature/20130131-is-it-worth-collecting-airmiles?OCID=twtvl&utm_source=buffer&buffer_share=673bc