If you don't mind my asking, could you please tell us how you test your products on CB to determine if they are worth spending time and money promoting?
Other good areas are the high competition areas - weight loss, make money, get your ex back (any dating related stuff really). These areas have high competition but they are broad appeal too. So even if you get a few visitors which are slightly targetted, you can make sales. $5k a month (as a vendor or an affiliate) is not difficult if you have a system in place.