one more tip to this: a good friend of mine, to better his chances to stay in business (at all, don't do it in first, do it only in business) when/just before they start counting, he (after having occupied the seat) dissappears to the (eco-) toilet and succeeds in having him counted as eco (and the overall-count, which is normally the only factor to delay the flight, because the might have to deal with "luggage without passenger" is ok anyway).