IMHO, he reads them all, but replies to those of "His" choosing. I highly suspect (theologically speaking) it has more to do with those whom are in an adoptive relationship with "Him".
Well, that's damned nice of him. So, I gather when I was a devout believer, he did not answer my shopping list because I was the wrong flavor of Christian (JW). No doubt, if I had been of a different belief system, I would have been worthy.
However, now that I have no relationship with him, just with the "Universe" (BTW, I kinda like your concept, but it detracts from the personal God I thought we were discussing here), and now that I enjoy the fruits of the spirit (love, joy, peace, etal), strength, intelligence, a decent home and a job with great medical insurance..... Who exactly IS reading my shopping list?