WHYEYEMAN
I think you are missing the point with the in flight sales revinue stream
The Scandinavians don't like high pressure sales techniques, infact it is the worst way to sell to the type of Scandinavian who has the most to spend ! ( it is also the worst way to sell to me !)
Norwegian has gone down the road of offering high class refreshments delivered promptly to the passengers and that is what the passengers seem to like, rather than what they see as the bullying tactics of RYR ( and to a lesser extent EZY) that just makes them shut their wallets.
It is all about knowing what the your passengers want from a flight over and above the safe and on time performance.