1) That paying more equates to higher quality. It doesn't. Your £30 t-shirt will fall apart every bit as quickly as your £3 multi-pack from Primark.
2) That you want to have something last a lifetime. Just last weekend, my dad was complaining about having no good jig-saws. Then followed up with "of course, I could buy a good one, but I only use them once every 5 years, so they're knackered when I need them anyway".
3) When you want quality, you can't just borrow it off someone else.
I'm not against paying more for something e.g. my uncle has expensive joinery kit because his day job is a joiner. I simply dislike the mentality of "I must pay top-dollar for everything", before you've evaluated what you actually want.