Why would one want your portfolio? A portfolio is to show what YOU can do, not what someone else can do.
As for the domain, how much webmaster traffic does it get? The only reason someone might want to buy it is to get a crack at the design work of people trying to contact you about design work, and it doesn't do alot of good if they don't know how much traffic there is.
Just some suggestions, so don't be offended.