What are practical ways someone can make an extra $100 a week?
You should learn doing Affiliate marketing arbitrage. ClickBank is perfect marketplace for this.
Affiliate marketing arbitrage is when a marketer purchases ppc campaigns with programs such as adwords and makes affiliate sales simply by linking to affiliate offers... As long as the affiliate sales are higher than your ppc costs you are making profit...
They most hard thing here is to find HOT products for this. And don't forget about high competition . By they way competition for ClickBank products not so high.
And this helps me to get results what you see in that screenshot =)