title_body: Why do people brew their own beer?
upvoted_answer: Hobby
  
  Some people do it as a pleasurable hobby.  You might also ask why someone would build furniture if they could buy it, or why they play a musical instrument if they can just listen to the radio.
  
  Personal Taste
  
  You may like a particular style of beer that isn't popular.  And, especially in Germany, you may want to make a style of beer that you can't buy in the store - one that has other flavor ingredients, so it doesn't comply with the beer purity laws.