I have only ever gone through one pigment jar. Kitschmas. But I used it for EVERYTHING for about a year. Nailpolish, on my eyes, mixed with a few other pigments to make a pretty lipgloss, and I made about 7-8 bottles of kitschmas nailpolish for friends who loved MY nailpolish.
And I mixed it in with a really nice thick cream and used it on my chest in the summer to add some "dazzle" (I'm SUPER pale, so it was really pretty)
Then I had about 1/3 of the jar left after all this (and making samples!) and my daughter spilled the rest of it. OOPS. (she started liking makeup when she learned to walk...oops)
DH just happened to be out of town, and staying near a pro store. So he replaced it (after demanding pictures of the spill), and bought me like 5 or 6 other pigments that the SA just told him he HAD to buy for me.
But thats it. I also put them in smaller jars for everyday use, then it's easier to swap for samples and stuff. I did go through an entire jar of coco beach, but I sold 12 1/4tsp samples on ebay...so the entire jar. (after realizing it turned ORANGE on me, ick!!)
Aren't pigments fun though?? I just counted mine last night, I have 60!! holy cow! (full-size, although many are half a jar or less)