Hi William, here is a video tutorial from Nick, it will help you to save up to 100% of captcha costs, I personally spend 0 money on captcha for over one month and there are more advantages doing that, take a look at the video.
Here are the advantages of re-using of the same accounts:
1. you will save up to 100% of captcha costs (depends on the diagram you are using), it saved me a lot of money running on my already made accounts.
2. it provides better rankings, because each blogs will receive more posts, and each blog will be more powerful and will provide more power to your money site.
3. the time needed for a campaign to end is much lower (70% lower time) because the process of creation of accounts doesn't exist anymore, and also the process of e-mail verification is not existing, so a lot more speed in creating of the campaigns.
Cheers !