Mascara is the one makeup product where there is a genuine hygiene argument for buying cheap, and it changes the whole value calculation. The tube is warm, moist, and opened and closed daily with a wand that has been against your eye. Replacing it every three months is standard advice for good reason, and a product you are throwing away four times a year is a product where price per tube matters more than almost anywhere else.
There is also a performance argument for replacing it. Mascara dries out as it is exposed to air, and a dried formula is thicker, clumpier and much more likely to flake — which on a mature eye means grit in a tear film that is already less stable. A lot of what people experience as 'this mascara has stopped working' is simply a tube three months past its useful life.
So the honest framing: buy a drugstore tubing formula, replace it every three months, and you will have a better experience than someone using a premium mascara for a year. That is not a budget compromise; it is the better practice.
What you genuinely give up at drugstore price is brush engineering and shade range. The premium brands do invest in applicator design, and a dual-sided separating brush is a real advantage on a sparse lash line. Shade ranges are also narrower, which matters if you want a well-pigmented brown rather than a diluted one.
What you do not give up is the tubing mechanism itself, which is the single most valuable property for mature lashes — and the drugstore version of it works the same way for a fraction of the price.
