I think that buying e-mail lists is not the best way to advertise. I don't like getting spam and believe most people would agree. Although some might be truly interested most will be irritated in receiving an e-mail that they don't want. I have some companies on my blocked list that I know are reputable companies, but I don't buy their products and got e-mails from them. It drove me up the wall. I think creating your own list is the way to go and always give people the option to opt out.