Hello Crzy, Welcome to INForum.
You should be aware that are many different types of domainers. For example, some flip domains for a quick profit, others build mini-sites to monetize and/or resell them, and there are those who hold domains as long-term investments.
There are many places where you can buy and sell a domain: Sedo, forums, live auctions and of course
INForum. You can also find further information
here.
With a domainer-to-domainer sale, the value of that domain is usually less compared to the sale of that same domain name to a potential end user.
It's typically more profitable to sell to an end user. However, not all potential end users will recognize or understand the value of a good domain name!
Good luck!