Ian, you are correct about cost to an extent and correct about difficulty to an extent. At EK, analysis of any processing solution or emulsion (or coating for that matter) was routine and a snap. I got back analyses on all of my processing solutions before and after use if they were experimental. In fact, such analyses are essential for determining how to work out seasoning and balance (see my post on steady state).
As an additional factor here, analysis is essential for patent infringement work and thus all competitor products are analyzed in great detail. This extensive work reduces the cost to being minimal.