The reasons workshops are so appealing to many people is they don't want to put in the truly hard work before hand. When I go to a "new" spot, I've researched it well in advance. I've inquired for local knowledge on forums like this, scoured the net for images of the place(s), maybe bought a guide book or two, researched sunrise, sunset, moon phase, sun angle, roads, trails, looked at the place 1,000,000 times on google earth, etc, etc, etc. I know where I need to be, when I need to be there. I also have multiple back up plans on what do to if conditions change. I don't know that many people willing to put in that amount of effort. All it cost me is my time but I enjoy doing it.
With a workshop, others have already done all that leg work. All the shooter has to do is show up and follow directions. Now there is nothing wrong with that and many people pay handsomely for the service.