Even the most expensive earphones come with stylish but functionally crappy earbud tips, which don't isolate at all and turn your £200 earbuds into a £5 one.
The price of 3rd party memory foam replacement ear tips goes from as little as £1 to even £50 a pair.
Question: why would I want to spend £50? What do they have that the £1 don't have? Is it just marketing?