I am a programmer, expert on web scraping - i.e. collecting numerous data from various websites. For using my expertise on my own business, I have developed a script that is currently gathering US business info, (email, business category, and contact info that can be sort by Zip/State/City) from various public/open sources. I am little confused, will selling email or contact address (by business categories, states/cities/zip, etc sorting option will be available) be a promising business? Or I should collect the emails and develop my own affiliate/email marketing business and use those email address? will the be better option? Or I should build a product manager that can manage a product list from a single panel to various business store like ebay/e-commerce website with Magento or WooCommerce/Amazon would be a better choice for future prospect?