Even with the SCWI I doubt you would get laid in a whore house while holding a fist full of hundred dollar bills. So, if that the driving factor in deciding whether to go for the SCWI, I would not bother.
However, there are advantages to holding the SCWI credential. One that holds the SCWI has demonstrated the ability to write a WPS and perform job functions not expected of a CWI. It differentiates you from mere CWIs and other SCWI want-a-bees.
Best regards - Al