On a personal level, quality has to be exceptional (or the color/finish very unique). More generally, I tend to keep permanent lines of products from popular brands, but I don’t keep most cream/gel-based formulas (like eyeliner, blush, highlighter, etc.) as I don’t find I need to go back into the archives much any more (to do side-by-side comparisons), so I’d rather pass those on while usable than sit around and get gross.
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