Simply because the “dupe” is not as good as the original one.
CT foundation, ot looks so good for me like no other product I ever tried
KVD Tattoo Liner. Does not budge and I looooove the brush tip as opposed to a felt tip.
I dislike drugstore complexion products. I could never replace my high end ones, in particular the Nars Light Reflecting Foundation, Dr Jart Premium BB Cream with SPF50, and a few concealers like Huda Faux Filter, Natasha Denona, Pat mc grath and the sigma colour corrector.
Another is setting spray. I have tried both high end and drugstore ones but the drugstore ones are not as effective for me. I prefer the UD and Charlotte Tilbury ones, I cannot find any cheaper alternatives.
Natasha Denona lip liners. I like creamy formulas that you sharpen rather than twist up. I have tried many lip liners, both expensive and cheap, and only this and Huda are creamy enough for my taste. Everything else I have tried is too firm for my liking.