Is "non of the above" an answer? We guess the answer then is skiers as they have $9.7 in prize money on their circuit as composed to $5.7 for the IAAF. 13.1% of skiers make more than 50k whereas only 6.2% of diamond league runners do.
Details here:
http://www.thesportsexaminer.com/download/makes-track-stars-world-cup-skiers/?wpdmdl=2771