Gambling circlets at lvl 92 costs around 90K a pop after Edge&gheeds. You can sell back the misses for 15-20K on average, so each try is ~75K
10% will be rare.
So, if you don't mind the base ( Circlet, Coronet, Diadem), you will get ~13 rares per 10M / Ist. Compared to 3 rares per 18 skulls / Ist. I think this (~13 vs 3 chances) is what Departure is aiming at.
Two more things to consider though:
1. When gambling, You can also get magic, set, and unique items (incl. Griffon)
2. Gambling has a wider range of iLvl so it's harder to control if you are aiming for something very specific.
I usually like using everything I farm myself. I use my own skulls and Gold and don't sell them. But I also don't (or only seldomly) buy them.
I reroll GCs with PGs, Amethysts go into caster amulets, and skulls in rerolling diadems.
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