Hold on there bobber.
Many designs take tons of work to complete, and involve a lot of engineering and permitting as well. The challenge of permitting alone, which is often but not always taken on by a firm, takes a lot of time and effort. Also included may be overseeing the building process, or at least monitoring along the way.
These guys have more business than they can handle for good reason. They are great at what they do, have experience with builders and developers, and have powerful reps. They also carry a lot of liability.
Also consider that more than a few owners building in SoWal developments are not always the easiest customers to please. And there is also the desire to be unique, and quite often a prestige factor. I've heard many a homeowner brag how much their design process cost and who did it.
The cost of draftspeople you mention, which quite often have degrees (even Masters') and experience, are very expensive in SoWal. Not to mention other overhead.
There can be sticky situations with DRBs and approved architects, but they add a lot of value to a development. A cost of doing business in situations where the returns around here have been off the charts.
I have a feeling you would have made a good architect. It's never too late. ;-)