But I can buy a real cocktail shaker for < $3.00. Isn't it a bit self-defeating to make one "with less than $5 in materials"?

Does this seem screwy to you too? I can go to Amazon and buy a six-pack of Tek Pro toothbrushes for $2.43. If I pop for two of those I'm set with a dozen brushes and can change out whenever I feel like it. Is anybody so bloody busy that they can't figure out when they need a new toothbrush that they have to pay…

OR, you could just avoid being stupid with your device and let it die gracefully of old age.