It seems to me that these results don't take into account the fact that presidents inherit the policies of the previous terms. Some presidents can ride on the coat tails of former policies and take the credit or blame just because they're the ones serving. It can take as long as 8 years before the consequences of bad policy can rear its ugly head.
Being greedy for money is when you cheat, lie, scam, steal, or abuse others in the name of money. That doesn't sound like that's what you're doing. You are not doing anything wrong. You are trading your time and energy for your hard earned cash. Also, working harder for more money can come at a cost to your health and time, so tread carefully. Money doesn't solve your problems or bring you happiness , and it is a false measurement of wealth and success. However, having it can give you the potential to live a good live by giving you options.
Discover your true purpose in life by finding a way to contribute to society, whether through your own business or helping someone else realize their mission. Money is just a way of measuring how much you're contributing something of value to someone else.
Instead of concentrating on money, start asking yourself how to create something meaningful that will benefit the world, not how to earn more. You can feel good about having a positive impact on society, and the money will naturally come fair and square faster than you can track it. You will also enjoy every minute of it and it will become play instead of overexertion. What's most important, though, is that you learn the skills to always be able to make money no matter your circumstance. Be the absolute best in your field and you will be set for life.
The opportunities will always be there today, tomorrow, and in the next century. There are millions of undiscovered ideas that will make you rich. The more time you spend worrying, the less time you'll spend thinking about your next idea. Also, be willing to stay flexible in your plans in case big promising opportunities come along that you are not expecting.
Avoid comparing yourself to others, no matter what it is about. (Money, possessions, relationships, businesses, etc.) It will always result in you suffering and wanting more. Focus on your path and what's in front of you. Count your blessings before bed each day.
Study Buddhism and meditate to help overcome your insecurity. I particularly recommend lectures by Alan Watts on youtube. Life is a delicate balance and you may be spending too much time on work without rest. Work must be balanced with personal growth, family, community/friends, and entertainment. The more you focus only on your career, the more time it will take to bring balance back into your life.