I think the section on customer acquisition cost really resonates with me.

The corollary, I suppose, is that once you have some customer traction, looking at where those costs are is where you want to spend time with optimization. However, this begs some questions:

If I'm spending $500 for a $5000 customer - should I change anything at all to drive down that $500?

...which leads to: At what CAC:Cusotmer Value ratio should I start trying to drive down that cost relative to other costs in the biz?

Anyone have any real experiences from their biz' they can share on this subject?