My conversion rate went from 2.5% to 8% just by including Facebook polls where SiteGround was rated #1, along with a few Twitter screenshots and Facebook conversations. Whether it’s Amazon reviews or Facebook polls, you NEED to include outside opinions – that’s why I don’t like collecting reviews on my website – they look biased. But you can use WP Review Pro to do this, allowing people to review the product/service on your site and get those review stars.
The amount of money you can make can depend greatly of you budget. If you have a small budget and you don´t have a lot of money, then you have to start with free marketing methods like article writing, blogging, forum marketing and such. It takes a lot more effort ant time to have success with these methods. But they are very effective if you keep writing articles and participate in forums. You can make $100 a day within just a few months just with article marketing.