This post originally appeared on the HubSpot Marketing Blog. I have an admission to make. I’m a revenue (sales) guy. I can think about, conceive and vision growth opportunities without even trying. On the other hand, thinking about (and understanding) costs doesn’t come so easily to me. I’ve learned that understanding your costs is crucial to creating profitable revenue consistently, sustainably and scalably. Unfortunately, very few small and mid-sized companies understand their sales cost...