Personally, I enjoy owning a few autos and one of the coolest folders I have seen in the last couple of years was the collaboration folder, auto, presentation auto that Michael Vagnino, Tim Hancock and Boyd Britt got together on. All three modes are controled by one button. I was tempted to get one, very tempted. (just could not since I have enough knives on order through 2003 to keep from getting any others

).
The main attraction was not the obvious "gadgetry" but the knife itself. Some beautiful Damascus by Tim with the action, fit and finish that Michael is so gifted with coupled with getting to talk with Michael and Tim about the knife. It was the first time I had the chance to meet Michael and his wife and he spent time with me as if we had known each other for years.
I guess what I am trying to say is if the knife appeals to me the mode of operation is not as important, but it does add even more appeal. At the same time, from the point of view of the market, it may narrow some on a presentation auto vs a full auto vs a manual. I feel that the market widens as you progess through that order of the "hierarchy".
Because I enjoy them and live in an auto friendly state, given the same knife and a choice of one of the three and no budget concerns I would choose a full auto first, but I still think the market is wider for a manual. (That should tell you that my taste does not necessarily follow the mainstream market

.)
Bailey, if I was considering a presentation auto I would try to come up with a way to make it work in a full auto mode or offer a full auto model or style. It will be interesting to see what you decide to do.