I always feel employed/consulting is not a scalable business proposition.
You're right to a large extent, but this touches on something that I always wonder about: why is the (western) world so obsessed with growth and scaling? Everyone seems to be looking for "fire & forget" businesses that they can set up then sit back while the product yields money. It's probably just the way I am wired, but I would rather earn my money by providing a service and get the benefits of becoming more efficient at that service, rather than selling "product".
Sorry, I'm probably off-topic here, and I'm certainly not answering your question, but I needed to get that off my chest.