The first step to writing high-quality content is, well, actually writing the content. Using duplicate content is a bad idea for a number of reasons. First off, it’s obvious plagiarism. Plagiarism, be it with text or images, can get you into a whole other world of problems. It’s theft, and there are legal and ethical ramifications. Duplicate content also doesn’t help your rank. Google looks for high quality and unique content. If unique, high-quality content is what you’re providing, Google is going to try and rank that content higher so more people see it. This is the goal of adding content.
The more unique content you have – the more people will see your site.
The more people who see your site, the more conversions you can potentially garner. Google isn’t going to rank sites and pages using recycled content very highly. They’re going to find the original creator of said content and rank that the highest, thus defeating the purpose of you adding the content in the first place.