I don't think you're incorrect about the difficulty of obtaining the value for really complex patterns. Some of my mosaics incur 80% or higher losses in metal by the time they're finished. You can make randoms, and variations on that theme, with 10% loss. Pressed in patterns, are somewhere in the middle.
Lots of new people in the scene, not just makers, but customers. Many "newcomers" are drawn to randoms, for whatever reason. I often get requests for really low layer, "bold" randoms or variations from makers, which I really dislike, but knife buyers in a certain price range really love. However, that's a stark contrast between nice medium-to-high layer, super active and chatoyant high end randoms.
On big knives especially, it's really difficult to justify the added cost of complex mosaics on anything below a certain price threshold though, even still, you're likely not covering your time, where as I could make enough randoms billets to last me 10 years of making bowies, in a week if I was determined (exaggerating, slightly).
I don't see any reason to discourage it, the nice thing is, even for the "simplest" pattern, there's tons of room for variation and distinction. If I were making a lot of kitchen knives, I'd be using them like crazy.