Im surprised at that, it went mad when i added mine after just a few weeks were talking from +-10 to +-400 a day. I eventually put in a human test and it dropped significantly again after a few months. I now get about 20-50 a day.
I think it also depends how visible your site is from other sites and search engines as the spambots obviously follow links and scan pages for addresses.
I think it also depends how visible your site is from other sites and search engines as the spambots obviously follow links and scan pages for addresses.