Politics has become a business in some number of countries i know. Where people from younger to older age are all affected. They are doing politics to gain their power. In all these countries murders, fights, thefts, robberies have increased because they are doing these bad activities using political power.
Actually, you are right. Many countries are using political power to get money by all means, whether in a good way or bad, after winning elections and forgetting people voted them in to office, and that is why most of these people cannot do what they suppose, and you know there is something again when someone leaves the office and spoils many things definitively. It will be hard for the new administration before they get everything back settled even if they wish to, and that is why you can see spoiling the new people's administration by all these negative things you mention.
Disadvantages of politics:
1. The number of your enemies will increase
The increasing number of enemies will be based on how you treat people when you are still in power or office. If you do good, people who love you will remember what you have done for them. Even though leadership has that one thing that no matter what you have done, a few people will still hate you, but that doesn't mean if you do good, your name will remain there as someone who tried for his or her citizens, so don't consider that one as a leader thinking that your name will increase. No matter what you do, people will still say you didn't try.
2. It will be a waste of money.
3. Your time will be wasted.
Let me give an example with gambling: if you win, you get your money back, even more than what you staked. The same thing applies to politics: you are the one who chooses to contest, so if you win, you will definitely get your money, no doubt about it. However, for the time you said, politics is not a waste of time in my opinion because it is just like work; if you do it, you will get money. When you don’t win, you will say you wasted your time in politics, but after you emerge the winner, what remains?