I don't think workers will be able to do 1,000 captcha an hour. Based on some comments here they were only doing 650-850 an hour. This means they would not even get 0.30cent/hour. What they will earn would just be for paying electricity and internet service.
The last time I work in captcha is very difficult because you need to use a VPN to bypass the application that keeps on blocking IP addresses so we can't do the task smoothly. It has also a thread here in the forum, I don't know if it is still running. A work like this is only for newbies and willing to get micro earnings...