So you wonder why I am saying this. It’s a fact. To a marketer, hacker and spammer, your email is worth much more then your credit card. With your email address, they can contact you again and again knowing that you’re interested in something that they are offering. Guess what an opt-in list is for? To gather your email address of course.
It’s true when they say there’s gold in your list. Your list (opt-in list that is) contains people who are already interested in receiving news or offerings from you. Once you have them, work smart, and milk them.
Word of caution. Never ever give out your emails easily to anyone or any websites easily. I always keep more than 2 email addresses just for filling out forms online and joining online communities and keep a personal one which I don’t use much and thus can only will get minimum spam.