How profitable blogging really is?

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I am quite skeptical how profitable blogging really is. I ponder how we earn and who will pay us the money. Is it when one of our friends or somebody who is discussing with us started to buy products from the sponsors of the webpage. I think so.I am quite excited with this kind of technology since it is now possible that we can earn even we stay at home. I am excited to discover more about this technology. I hope it will be realized soon. Tell me about how profitable blogging is and if you can show me some proof like pay cheques, account, etc..the better.