Salary
Average Salary: $77,490
Expected Lifetime Earnings: $3,235,000
The pay in this career field varies across industries (source). However, a salary of $80,000-$90,000 is not unrealistic given the heavy workload and the amount of time you'll spend jetting around the world. Furthermore, many companies offer bonuses to their employees in international sales based on individual and/or company performance (source).
Also, you may make your counterparts in domestic sales jealous if your company wants you to live in, oh, Japan or Singapore so you can be closer to your clients. Because the costs of living in those places are higher than in the U.S., your employer will have to pay you more.