Given that, it might be instructive to get a handle on what the buy values at $50,000. Could just be the domain name and/or the "host authority" (when a lot of other (legitimate) sites refer to your site on the web it is perceived by search engines has having a bit more 'authority' than other sites.
If it's the latter you might find they buy it and replace your content with a bunch of links to porn web sites. You'd want to be ok with that before you sold it.
If it's the latter you might find they buy it and replace your content with a bunch of links to porn web sites. You'd want to be ok with that before you sold it.