What do you think does the hack domains are more precious than a simple one? Hack domain eg: preciou.us , doma.in, coffe.in, del.icio.us
Domain hacks are not as valuable as if that domain wasn't hacked, eg. Doma.in is not worth more than Domain.com, etc. If you want to know more about them, check out this thread, it has all the info you want. So far 44 pages & growing: http://www.namepros.com/domain-name-discussion/299608-value-of-domain-hack.html