Why? Would you happily make a living completing microjobs?
I started freelancing on Clickworker. It was ok as an “I’m just experimenting and don’t really need the cash” kind of job. Seeing it as anything else is just silly.
The microjob market is a content mill come ponzi scheme. Sign up, start doing some orders (average pay $0.25 - $5), then get more orders the more orders you complete. Take a break or have a single less than satisfied customer, and you immediately get fewer orders. Someone else just behind you gets them instead. Then someone behind them and so on.
Overall, the premise of a microjob is fine. However, in practice, it might as well be called Slave Trade Part Deux.
I’d say it was ok, 5 -10 years ago. However, now most people want to hire someone for a microjob, but few actually want a microjob completing. I just hired someone to install a new SSL certificate on my website. That is a microjob. However, the vast majority of microjob clients would add something on to that by saying something like: “Great! And can you install a new sitemap too?” Or “I need to speed up my page loading time, if you can do that, I’ll mark this as complete asap.”
Most if not all such problems arise because clients know that they can get away with making such requests, imagine you charge $5 because you can pay the mortgage with that where you live. (And should be eternally grateful.) - Or they (like most people who hire micro workers) are resellers.
As for how you as a professional stand out on a microjob site… Basically, the magic trick is to have a UK or U.S. location. :)