If you don't verify email address, someone can register with an email account which does not belong to him, then subscribe some high traffic threads and use your board to spam someone else account. Needless to say it's you who will deal with complaints. The account owner can complaint to your hosting company too and it's a high possibility that they will regard this as SPAM and either close your account or give you a serious warning.
Not a suggested practise to disable verification..
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