Why the need for a database cleanup? Simply put, a business can confidently claim success when ROI is consistently good, and ROI flows in when theres enough or more legit customers buying your product or service, otherwise there wouldnt be any business at all. The bottom line is, a business should keep its database in best health by getting rid of dead leads or zombie leads (as ThinkAdvisor calls them) in order to optimize time and effort on highly converting leads.