That was the most lame excuse ever regarding a scheduling conflict...he's so busy that he couldn't stick around another 15 minutes to answer questions. What a complete dumbass. This guys is really clueless.
The truth is that he probably didn't want to get stumped on a question and make things worth than they already are. The minute he would have put his foot in his mouth, it would have been over for DNAX very quickly.
As an investor, I prefer that he answer questions by email than off the cuff. I say this because if he would have put his foot in his mouth, there goes any shred of hope of recouping any of my money.