What your "confirmation email ratio" like?

Hey guys,
My forum is starting to get some traction. But a lot of my users have not confirmed their email. About 50% of the people who sign up still have their status as "confirmation email".
Is this normal? What is your confirmation email ratio?
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I've rarely had people who didn't get their confirmation email. Are they going into spam folders on the big webmail clients perhaps?
The other reason is spammers. 99% of my users who haven't confirmed email are simply bots who haven't, or can't.
Unless you want a valid e-mail. It might be worth turning off confirm e-mail, setting up approval, and installing botstop plugin. Best of both worlds, users can login without valid e-mail , you block bots, and you decide who you are going to approve. Unless you find things becoming overrun by spammers or unwanted users. - you might increase your user count (good as well as possibly bad.)
I may not provide the completed solution you might desire, but I do try to provide honest suggestions to help you solve your issue.
Actually I do want valid emails for marketing purposes... but that botstop plugin looks like a good alternative to recaptcha (which I think is annoying).
It seems my confirmation emails were going to spam. I have configured Mandrill.com SMTP to handle outgoing email, seems to have fixed the problem. Also it's free for first 12k emails a month so should cover me for now.
Lets hope it improves