Do you think obese people should pay for 2?

2 airline seats, 2 bus tours and so on...., I really can't see the fairness in having to pay for 2 contiki or whatever tours just so I don't have someone sitting next to me. Am I eating 2 meals- NO!, Am I sleeping in 2 beds- No, Am I entering in a guided scenic tour twice- NO. What are your opinions?