Based on another thread about what you can "never" spend too much money on, all I could think of is what people spend too much money on when they don't need too.. my list is as follows:
Loo roll - it basically does not matter unless it is the weird paper stuff we used to have at school
Any branded cupboard staples - I can never understand why people would buy a branded product like flour, pasta, salt, cornflakes, teabags, salt, sugar etc - it is what it is regardless of the name on the front.
Handbags - now I like a good handbag, think LK Bennett, or Ralph Lauren but I simply don't get the £££ on some really high end designers that you put in a dust bag and leave in the cupboard for 363 days of the year.
Shower gel - it washes you. I cannot get the difference between Molton Brown (£21 a bottle) versus a supermarket brand for £1 a bottle.
Washing up liquid - they all do the same thing
Weddings - especially flowers.. Nah,
Cars - I do remember a relative of mine buying a £50k car. I bought a £25k car and both of them did exactly the same thing (apart from drive) and had exactly the same gadgets. One was a Range Rover and one was a Kia.
Dogs - my very hard up friend who I subsidised during lockdown just bought a 2k puppy. What about battersea dogs home? a companion for life for free?
arrghh..