Having a business completely online it's the best way to make good money.
Since you don't have to pay rent, maybe any tax in some countries etc.
Being completely in digital goods market is risky too but has good income.
Yes it is, it is the cheapest form of earnings, and you only pay income tax usually, maybe vat if you do physical goods.
I would certainly like to make tons of money online, as i hate my current job.
There are many opportunities to run a business online.
You just need a smart team to build the basement and then hire freelancers.
But remember that whatever you try to do, try to be the best.