Whether your feedback to companies is positive or negative, all is welcomed. Companies are open-minded in accepting different types of opinions, as feedback is valuable for their product development – to design a better/improve the current product. So don’t worry about “not being paid” if you provide negative feedback. Perhaps a company saw your opinion and was inspired to make a new product – and bang, a new generation of smartphones appeared.
I almost didn't list Swagbucks here because, while it's a great rewards site, they list in their terms that you can't expect for up to 10 days after you cash out. However, it's still an option to earn fast cash because some people report getting paid much faster than this. You can redeem you SB (Swagbucks) for Amazon codes, Paypal cash, and gift cards to popular merchandisers among other things. These points build up quickly thanks the the large number of things you can do on the site to earn. I've used this site and been paid many times.
Amazon offers a service called Fulfillment by Amazon (FBA), which can be extremely useful for arbitrage sellers, or others selling their own products. If you opt for FBA, Amazon will store, pick, pack and deliver your products. That means you can scale your arbitrage business quickly as you don’t have to store products in your own home or waste time with postage.
Teaching and tutoring English as a second language is a great way to make money online, not to mention open some doors for you to travel the world if you'd like. While full ESL (English as a Second Language) accreditation is recommended, as long as you’re a native speaker and have the ability to teach, there are people in countries such as Hong Kong or the UAE who are willing to pay upwards of $25/hr for you to tutor them English via Skype. Check out Indeed, Learn4Good and Remote.co for remote english tutoring jobs or sign up on a specialized site like VerbalPlanet or Chegg Tutors.
If you’re looking for inspiration, my friend Michelle Schroeder-Gardner of the website Making Sense of Sense has become the expert on all things affiliate marketing. Michelle earns more than $100,000 per month from her blog and the bulk of her income comes from affiliate sales. Michelle has had so much success with affiliate marketing that she even has her own course called Making Sense of Affiliate Marketing.