You're simply alerting Google to the network in the process.
Think about it, it would be simple for Google to put a system in place where if a site is cited in more than two webmaster's disavow links file then it is likely a link network. In the process some people might submit all of the blog network in their disavow links file, including indexed sites.
Think about it, it would be simple for Google to put a system in place where if a site is cited in more than two webmaster's disavow links file then it is likely a link network. In the process some people might submit all of the blog network in their disavow links file, including indexed sites.