yes primrose oil is pricy as well, but not as bad as argan. thats y i do half half. i dont use it as a base, though i put a splash of argan oil in. just so i still get same of benefits from it. sealing your ends with it would be a great idea as well.
and argan oil helps control oil. i use it, (half half) as a growth booster, of cause i feel that i have oil on my scalp once ive messaged it on, but the next morning its all soaken in. i also use my mix to help with my bf's dandruff. after 2 used its all cleard up.