Depending on your goals/needs, FF can be cheaper. Consider that 85mm f/1.2 on APS-C is equivalent to 135mm f/2 on FF, and compare the cost of the lenses.
I thought I would be the only one to see that, although I hadn't thought of portrait lenses.
Of course it doesn't apply to every scenario.
100D/6D/5(film)x2/650(film)x2 & EF-S 18-55 STM, EF 15/2.8 fisheye, 24/2.8 IS, 50/2.5, 50L, 70-300L, Fotodiox Pro adapters; QL19
Pentax S1 & 55/2; Olympus OM-10 & Ensinor 28/2.8, Zuiko 24/2.8, 50/1.4 & 135/2.8; XA/2; Mju 410
Apple iPhone 6 & iPad Pro. I use all the above from time to time.