Welcome back to The TechCrunch Exchange, a weekly startups-and-markets newsletter. It’s broadly based on the daily column that appears on Extra Crunch, but free, and made for your weekend reading. Want it in your inbox every Saturday? Sign up here. Ready? Let’s talk money, startups and spicy IPO rumors. The huge sale of Utah-based startup Divvy to Bill.com is still bouncing around my head this week, not only because the $2.5 billion exit was huge for both the company and its local scene, but also because its target market is…