The new customer sales journey is a long and arduous road, requiring marketing for brand awareness, cultivating interest, and encouraging taking action. But the current customer sales journey? It’s like a quick trip down to the market to pick up a carton of milk – at least in comparison. Marketing Metrics estimates that the probability of selling to an existing customer is as high as 60 to 70 percent (whereas the probability of selling to a new prospect is between 5 and 20 percent). Customer Success capitalizes on this, and so do the fastest growing companies.