Premium domains"At $5,400 per year, you’d be investing $54k if you want to buy and hold for ten years. $54k gets you a gem of a one word dot com… I’d be willing to sell my Fanboys.com domain for just $7.5k or Instability.com for $3,500, after which you’ll only pay 8-9 bucks a year to keep them".
Source: http://domainingtips.com/premium-renewals-just-dont-make-sense.html.