“It’s not fair that the janitor sweeping the floors at the Toronto Stock Exchange, all of their income counts towards income tax, whereas the people trading the stocks on the stock exchange, half of their [investment] income counts towards income tax,” he said.

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Do you think the janitor would invest his time and effort and some years not get paid?  Or would have to give some money back? 

Investment income/loss comes with significantly  higher risks than salaried income.