I have never purchased a cue without first holding it in my hands, and hitting some balls with it before money changed hands. I don't care who the cue maker is.
I did have a cue made with a design I came with, but we had an understanding that if I didn't like the way it came out, I would not be obligated to buy it. He said it would sell on the open market easily, so no worries, that if I didn't like it, we would get our heads together and try again.
I have known several folks that have purchased some high end cues, that just didn't hit as well, as the one they currently owned from the same cue maker. In my view, being obligated to purchase something before I see it, or try it out, is just not something I would consider, no matter who made the cue.