Broadcom expect profit margins of 50% from their business units. They have stated this publicly many times.
In CA, the services division, just like any professional services company, had much lower profit margins. Broadcom are simply not interested in this type of business, so they sold it to HCL.
However, Broadcom did recognize that enterprise software products do require a services division, so they entered into a special privileged partnership agreement with HCL.
What sort of margins does CSS have?
My guess is that it's also a people-based business with profit margins similar to professional services companies. So quite likely to be sold off.