If you have to earn $50-$100 commission you have to sell product of cost $500-$1000 (If you’ll get 10% commission). If anyone who is reading have the potential to sell product of this much amount then why not he/she should start selling his/her own product. And money ultimately comes when a service or product is sold! So if you can write an Ebook then write another which you can sell for money!
One of the cool things about Google AdSense is that it's so easy to get set up. If you have a blog or website, you can sign up for a free Google AdSense Account. From there, Google will give you a unique code that you will paste onto your website. Google takes it from there, tracking your page views, traffic, and earnings on your behalf. There is no upkeep or maintenance to get this thing going, which makes it a no-brainer if you have a website already.