If you have low quality you don't get as much money. If you right high quality you get more money! The best way is to write, write, write with good quality
It depends of the type of content and the amount/quality of traffic! You can't give an answer to this question until you try it yourself!
yeah nijakum is right, you should better concentrate on one site because no matter how many sites you have that doesn't mean you earn more. i own more than 10 sites but have since i can't concerntrate on all of them i earn nothing on most.
100 sites will not 100% guarantee you can manage them all..just focus only 2-3 good quality website that have quality content..Adsense Guru just manage 1 blog to get 2000$ per month maybe more than that..depend on our efforts. I'am sure that enough to make money from adsense
100 sites it's too much. .....you can't control them....keep focus in some of youy best sites niche and you 'll be able to get high paid ptc.....and good luck anyway
100 sites ! wow...very difficult to maintain..better focus on max 5 sites with good quality content and keyword