they are doing them challenges that give ya 3 favor points each time an probably hit bosses up that give ya a chance for a favor point an etc
there are specials of late , when they have the sales, not sure exactly but they have to use FP's whether they buy them or they save them up, how do you know is someone spends or doesn't anyway lol I don't see the sale since I have full clan and have for some years, by buying them, there is no other way.......