They are all worth less than zero, just like .co and .mobi. That's right, less than zero. The extensions are scams and as a whole cost domainers and the world lots of money and time, and the time wasted will NEVER be replaced.
Same old story year after year after year, and that is one of the reasons that domain forums are now worth about 1/20th of what they were at the peak. Nobody stepped up and did the right thing, so what has happened is perfectly fair, and well-deserved by the domainer community. Even guys like Rick Schwartz, who I root for and respect, fell victim to the lure of easy money, as he listed, and probably still lists, these absolutely worthless extensions at his auctions, and he is the biggest fan of dotcom.
Remember Flowers.mobi? He allegedly paid over 200K for this, then sold it for 6K last year. I believe the second sale. That Flowers.mobi so-called sale caused a ton of damage to the domainer community as a whole, as these message boards were overrun with garbage for multiple years after that. Same thing with the disgraceful scam involving Overstock.co. It's all garbage. Always has been and always will be.
Any and all people associated with it should get awards for being LOSERS. If Rick can fall victim to it, then anyone can. I hate to even mention him, as he knows that dotcom is king and tells people that all day long.