We've tested hundreds of sites where you can take paid surveys for money and we've found that Swagbucks by far is our #1 pick. They've been around for years and have a solid track record of paying their users. Plus, we also like that they offer opportunities to get paid for doing things other than surveys, like signing up for offers or shopping in their portal.
You said that you didn't have good results with Opinion Outpost... it really depends on a lot of things. Your demographics - age, race, income, level of education, where you live, if you have kids, the things you buy, if you're a student, if you're employed (and what you do for a living) and so on. It's worth it to fill out as much of your profile as they provide, because that lets them target you when a survey requiring X, Y and Z comes in. If you're not particularly useful you might not get many surveys assigned to you, or if you're like 75% of the rest of their panel then maybe the surveys you qualify for are filled up before you ever see it. Some panels also have varying levels of support. Inevitably something will go wrong with a 30 minute survey and you don't get your points and depending on the site they may fix it quickly, slowly, or not at all.
I run a travel business on the side. I started off with all the places I've visited since my childhood and with some help of Google, built itinerary of these places on the side. You'll start off with minimal bookings with your close relatives and friends. And with your first hand experience of having visited these places, you'll have an edge over others selling it. It'll start off slow but if you have a good network, it can pick up. Once you start making enough money, use this money to travel to new places and build an itinerary out of these again. You get to travel and explore new places plus you get to add options to your business.
Last but not least, you can also earn money online by building an online community, although the monetization strategies you can pursue will vary a lot depending on your goals. You can build a community with a blog, for example. You can also build an online forum and charge people for membership. You could even build up a Facebook group and use your influence there to sell and promote products.
As you can tell from the list, I just stick to the higher paying and passive earning places. I am far too lazy to give it the kind of effort you do. Although in my defense, I live in Australia so I don't have access to the high volume sites like Mturk. In fact, most of that is useless here - the only ones on that list that work here are Prolific, UsabilityHub, the Reddit subs and of course Ebay. Redbubble probably works too - I haven't tried that one. I use Teespring.
Swagbucks. This site offers a lot of opportunities for surveys, but disqualifications are frequent. Sometimes we got disqualified just from clicking on a link to a survey. Swagbucks aggregates third-party surveys, so some sites it sends you to are better than others. It takes a long time to earn points, but the site’s expansive rewards marketplace has hundreds of options to choose from, including gift cards, sweepstakes and PayPal payments. Check out our full Swagbucks review.
While you won't make a lucrative sum by selling your photos online (unless you're a gifted photographer with in-demand images), Shutterstock will pay you 25 cents every time one of your images is downloaded, according to its website. If you earn $500, then you'll receive 33 cents per download; if you earn $3,000, you'll receive 36 cents per download; and if you earn $10,000 or more, you'll receive 38 cents for every download.