True story: A SWA bud of mine called the other day to ask about NK's bag policy because he was going to purchase a ticket even though he could JS (on us) or non-rev on SWA to his destination. Knowing he would get there sooner by flying NK, non-stop, he sprung for a ticket: A three leg "commute" on SWA just didn't really sound all that fun to him.
Moral of the story: even "cheap airline pilots" can afford tickets on NK