Can we really make money on internet and if yes is that worth

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I have seen lot of case studies and people work very hard to make 10$ in week on internet. Adsense, yahoo and some of them like that. Webmasters try different options and are very excited and by the time they get to know about this they already lost lot of time. What do you think guys. I have a website on which I made 100$ in 2 months with 200,000 google ads impression. I worked very hard for that time and was very excited. I am not sure is that worth effords