ABSOLUTELY the most potent, high profit, and cost effective traffic you can possibly have! If you have high volume traffic and are not collecting email addys. You're leaving $$$ on the table. That's for sure!!!
Just a few suggestions:
Do everything above board. Keep all IP, dates, and time stamp information. Double opt them in and HONOR ALL REMOVES immediately!
Mail every day, and you will add serious coin to your bottom line
