Hi MFC Memory Foam Comfort,
Some of the reasons are listed in my previous reply in post #4 here.
The requirement to separate production lines for blended Talalay and organic Talalay would probably be enough by itself for a company to decide not to produce organic Talalay given the very small market that it would have.
Now that Radium has the Cradle to Cradle Gold certificate which also covers some of the same criteria as organic certifications (such as social and environmental considerations) there would be even less reason to have an organic certification.
Phoenix