Just my $0.02...
As Ralph and Glen point out, there are many with planers and sanders who prefer to buy their material in a "rougher" form and without the possibility of imbedded sanding grit. There are also many who either do not have, or do not want to spend the time, planing and rough-sanding.
I believe that there are two niches out there and you can choose to fill either or both. In the Anchorage market, the largest local cabinetmaker's wood supplier sells about 95% of their wood S3S, or two nicely surfaced faces and one straight edge. Cabinetmakers can order rougher wood but the suppolier tells me few here do.
When I was in Colorado I noticed there were sawyers selling raw or kiln-dried slabs, so I've no doubt there's a market for that too.
For commercial buyers it would seem to be a matter of their labor / equipment costs that makes their decision.
I propose that you consider your local market demand, determine what value-add you wish to provide (or what makes you the most $$
) and go from there..
That's my opinion.. and as we all know, opinions are like... noses... we all have one... but only yours matters to you! <g>