I believe .biz is similar to ngtlds, same as .info.
Searchterms you wont be able to sell. Somebody asked earlier about countries names under .biz, I still believe that they have value and the value is almost unchanged in the last few years.
lets take Canada.biz, great name for a Candian Business Directory.
Which one is better CanadianBizDir.com CanadianBusinessDirectory.com, CanadaBusiness.com?
What would you recommend to your Startup client? For me, the short name wins.
Canada.biz, and most probably eaven the chapest. How much would it sell for? 10-15k USD (not Canada Dollars.
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.biz has a meaning - TLD, what almost everbody in all languages understand like .info
Of course we can not compare it with Canada.com but that is not the purpose of .biz, it is simply an alternative for businesses.
I still have 259 and I am dropping many, those which do not match the business Category, because those I wont be able to sell. Some are developed, and they rank like a .com or .de. there is no disadvantage in Ranking.
I have two 1-letter .biz names: i.biz and x.biz, i.biz is perfect for any type of internet business. x.biz is cool for a currency exchange/Bitcoin or what ever....
.biz is not dead. .biz is just not that liquid like a .com, but more liquid as a ngtld because the TLD is established and users know the TLD.