A lot of them do pay out, but when they do it's peanut dust and very rarely worth your time.
Exactly...takes a considerably long time to collect anything of considerable worth. Say you earn 2500 stats per day (that's on a good day) for a whole year
365 x 2500. = 912500 satoshis (0.0091250BTC) just shy of around $5/$6
Faucets don't exist to provide you with a viable income. Use them if you want to, if not - don't.