WTP to econ is a lot unfair!! Agreed no competition on a 10 hour sector but the costs reflect this!
KLM do have some seat back TV's, it depends which aircraft you are on, I had them on an East Coast run and would expect most do. Maybe on African routes etc, won't have the same chance of success.
31' pitch, that's the same as BA will give you so no difference there.
A large independant survey ranks them identical to BA on all other assesed items too. AMS is a good airport to transfer in and if you include a stop-over a great city to explore - for more reasons than the obvious!