Update: I just got into this, gonna try this week and post the results
https://www.idownloadblog.com/2017/01/13/how-to-modify-about-this-mac-hackintosh/
TL;DR: Buy old mac, edit the about this mac page to show it as a new model with bigger features like i7 processor 16gb ram as opposed to 4gb which is real etc, also get a serial number from somewhere to make it seem like the warranty is still going, you can make up to 500$ per sale doing this, I will post a field report later, I am gonna buy a 300$ Macbook Pro 2010 now xdd