Kind of gutsy of Samoan Air, I guess, interesting to see if it spreads, or if it lasts. Putting your baggage down on the scales first, then stepping on yourself overcomes the embarrassment of everyone knowing your weight, I can see people blaming their super-heavy baggage for the extra 20kgs...
I know the bottom line is, weight ,for any transport operator . I do agree with the fact, that if your butt requires two seats ....pay for two, otherwise Im not sure.
Jetstar for example ....if you even think about having a baby , they wont let you fly .... and if you look pregnant (even if your not) forget it .... great way to generate a customer base.