Not all posting contests are scams though. I have entered some of them and have been paid successfully. You just need to do the proper research before venturing into such a thing.
You really just have to surf around and never think something is too good to be true! E.g. right now I have a posting job for $1.50 USD per post that is approx. 150 words and I am going to give it a good go!
I have checked above links but it is difficult to find such jobs . Another aspect of these jobs are , Those are limited and short term jobs (50 posts)
If someone is looking for long term jobs then there is need to low the rates ,
Hey next time if you land up in such lucative offers then do inform us also. Its not good to be mean and selfish. .50c is too good an offer to believe.
I don't take part in posting contests because they are too good to be true. I always participate for fix money for fix number of posts. That way it is less chance to get scam.