Well, the context here is user acquisition via advertising. You are talking about user acquisition via field sales teams. So, apples to oranges when compared directly.

But anyways, in both cases what matters is the LTV of the customer vs the acquisition cost. The scale of the number doesn't matter.

I doubt this same scenario is happening with field sales teams anyways. It's much harder to scale up your field sales team than it is to just raise your online ad spend.