When you have 8+ versions of the same razor ( looking at my Gillette tech collection)3. When you have a backup of all your razors, 'just in case.'
Well any scent you have in multiple brands (for me it’s tobacco and almond scents)10. When you’re trying to decide WHICH lime soap/cream to use (“Hmm, I could use the Captain’s Choice… or I could go with the GFT… or I could use my Castle Forbes… but, there’s always my Cyril Salter…”).