No. On average, I think you are most likely to be sitting next to someone who has had somebody else (employer) pay C fare for him.

Not that I mind that or consider it unfair in anyway. There are plenty enough good reasons why this should be so, but I find it rather inappropriate that people who do not pay for their tickets and use the points generated out their employer's budget for their own private use should then complain about other people being upgraded, on operational grounds or otherwise.

Not that I suggest that this is your case, Erik. For all I know, you may well be paying your C class fares yourself.