Just for the added benefits (that you may not use) it's worth it.
Way back in 2003 I got a Cap1 Platinum Visa with a $1300 limit and got auto CLIs to $3400. After several years I got a letter saying I could convert it to a QS Visa Signature and the final CL before I closed it was $11k. Was the offer from Cap1 what allowed the CL to grow? I don't have an answer for that, but I know it grew faster after it was a Visa Signature.