I always thought there was another reason for VCs encouraging founders to sell shares: giving them a taste of wealth. If you're a founder that sold 2M in stock a year ago and a 200M acquisition offer comes along, you'd be less tempted now that you appreciate the difference between small millions and big millions.

If you thought you had a real chance of going much bigger, having cash already makes you more willing to take that risk. And since VCs tend to make most of their money off a couple very big wins, it's worth it to have founders that won't settle for less than billions.