Fair price would be reg fee. Half isn't a commercial word that people compete for, if you put it into Google, there are no sponsored links. Also, it doesn't make much sense as an online brand, why would somebody want to tell somebody they are only half professional?
I can see 3 positives, Half.nl has 3 bids on Sedo so maybe it has more value in Dutch, Half could be used to sell half price goods although eBay and Half.com might object to that, finally Half is a surname, although not a very common one.