Selling your services to corporations is an attractive proposition. The contracts are larger than with small businesses and individuals, and often longer-term. There's the possibility of repeat business worth many billable hours at respectable rates.But the best clients are not always the easiest to get. If you don't grasp the realities of the corporate environment, you may sabotage even a hot lead. Here are five important keys to working with the corporate buyer.1. Managers are busy. This is ju.