[nicky0]

£3 fee isn’t a withdrawal fee, it’s a transaction fee to sell your bitcoin for pounds. The actual withdrawal of pounds to you bank account is free.

Likewise, you could withdraw your bitcoin to your own wallet for free. The fee comes when you change from one type of currency to another.

I think the reason they don’t show return on investment is because Coinbase presents itself as an exchange, not an investment platform. The purpose is to facilitate the exchange of currency from one kind to another. They’re not positioning themselves as trying to help you build up retirement nest egg.