You can sell it for however much you want to, there aren't any rules regarding that. What you should ask is how much should I sell it for, and for me to be able to answer that question I would need to know which motherboard your console has, whether it's dual nand, and any possible damage such as scratches and scuff marks.

So to answer your question at the moment, you can sell an rgh anywhere from $0.01 to $1,000,000. But you should sell it anywhere from $50 to $300 depending on the questions I asked above.