| It was necessary to impose a limit because some malicious users were using this feature to combine email addresses that belonged to other users (and had gained access to the victim's email address and password through their own means).
We recognize that some users may need to legitimately retire more than 10 email addresses, and we will personally address these issues on a case by case basis. If you fall in this category, please send email to our general help email address describing your problem.
Please note that we do *not* support retires as a way of creating 'sub-teams'. We know that a number of participants would like to see this feature implimented, and it is on the to-do list. Please be patient, as this type of change is a lot more complicated than it looks, and it will take some time for us to devise a system to handle it.
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distributed.net Faq-O-Matic : 
Why can't I retire more than 10 email addresses into one?