This is ridiculous.  Glassdoor encourages to look into those job opportunities, while the demand for those professions is so low!

For "Special Agent":

• Total median pay: $125,000
• Median base salary: $121,000
• Job openings: 85

For Airline pilot:

• Total median pay: $134,000
• Median base salary: $120,000
• Job openings: 116

For Reservoir Engineer:

• otal median pay: $143,000
• Median base salary: $125,000
• Job openings: 23

For Geophysicist:

• Total median pay: $119,380
• Median base salary: $109,864
• Job openings: 117

You're right that people are better off specializing in something where a lot of jobs are available. 

BusinessInsider explains how to get these 11 jobs:

http://businessinsider.com/how-to-land-one-of-these-high-paying-jobs-2016-7