I do not use captchas on my site and i do not use verify email on my sites and i have zero spam. registering my site is as easy as it gets, if you want members you got to find another way to deal with spammers. Like hack the spammers computer/server and and leave them a warning message if you come back i will wipe you out! "Punk" works great for me.

I run dolphin , phpbb and vbulletin and i have Zero Spam!

Think like a spammer lean about the tools they use. i have a copy of all of see more them and know there limitations and weakness. makes it easy to defeat them.