Yes, CaptchaCoin does resell captchas. I would promise you that I do not tamper with the accuracy, but there's no way to prove that, so it doesn't really mean anything. I believe that my captcha supplier is the dishonest party here, especially because he has not paid me in 4 days. The fact that it takes a few minutes for the balance to update is also caused by the supplier I'm using.
I'm in the process of implementing an API to allow anyone to submit a captcha they want solved to CaptchaCoin, which should fix these issues. But realistically, I don't know how many people would actually use the API.
I'm sorry that most people's experience with this site has been less than satisfactory.
I want to do work on this and I have one try after solving 50 its showing just 11 and and accuracy just 23 so I was shocked because I done work for some companies and my accuracy is 95 to 98 if you will improve this then may be few peoples work