I recently had a discussion with a CFO of a major entity. During our discussion he mentioned that they were looking at the overall revenue base and found that the bulk of their revenue came from just a few customers. Further, they had build a significant support structure to generate and manage that revenue. Not surprising when you think of the 80/20 rule which holds time and time again.
The reality is that this is likely true for many organizations. It is hard to turn away business, but ...