mindboggling pension scheme

The pension scheme is an accepted practice in the govt service introduced by the British. Now this scheme is also extended to politicians, people who are elected by the people on a 5 year term basis. And it is not even an employment. Then all one needs to be entitled to the lifelong pension is to be in office for two terms or a max of 10 years. Invariably it is lesser, between 8 to 9 years.