People writing down the numbers on live roulette

Is there any particular reason why people write down the numbers that come up on roulette at live casino venues. The numbers are purely random, I hope, so I don't quite see the point in doing it.

I think it's a marketing tactic that casinos use to make players think that they are more able to predict where the ball will land if they actually study the wheel for a while. Only a sucker would really fall for that!