Getting traffic to your website is not easy and I guess you figured that out by now.
Now we have all this new advertising with Google and Yahoo and people getting used to see the ads and not clicking on them. Spam is a bad way to get traffic and you can get banned from so many ways I can not even count them.

But opt in list is still an option, there is nothing illegal or against any moral principal to send opt in email.
The people that get the email have subscribed to an email list and are expecting the email to come and will not be angry complain when they get them.
Just make sure that your opt in email provider really have the subscriber permission to send the emails otherwise it can backfire on you.

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