I think a larger multiplier is neccessary for landing. Such a small margin between the guys that don't and the guys that do can result in the player who flies the most gets the most. Whereas the player who lands the most may get left behind.
I recall from AW that a player could fly 8 hrs a day get 1000 kills a tour, yet if he died most of his sorties his score would be negligible. The player who flew 300 sorties averaging 5 kills a sortie and landed 90% of his sorties would have a higher score than the wash rinse repeat guy.
There were other multipliers as well, each sortie, with kills, landed in a row had a further multiplier added. For example 6 kills landed sortie 1 might be worth 8,000pts, 6 kills sortie 2 may have been 12,000pts. One 6 kill sortie crashed maybe only worth 1k pts.
I believe there may have been a multiplier added based on distance from takeoff field travelled as well... not sure.
A larger multiplier I think adds some incentive to landing..
AKskurj