Hi Jack.
I too have responded to Mr Bartley with a question, possibly more than once, no response so now I just look without fuelling the ego! Also reluctant to comment, but thought I would second your comment.
Edit.
I just checked Mr Bartley's posts, it would seem that he is often on tour in various parts of the world and has responded to some comments, but not many but then he seems to be busy so perhaps a bit of slack is in order?
Cheers, Graham.