[FabHK]

Also, depending on your jurisdiction, you pay taxes on dividends. So, it makes sense (while you earn) to invest in shares or funds that don't give you income (they pay dividends that you have to pay tax on), but capital gains (they increase in value, but you don't have to pay tax on that until you realise the gain, ie sell).

Once you're retired, you can switch from a capital growth portfolio to an income providing portfolio.