Cracked sealant, especially on the handles and around the strap attachments/loops, is pretty common. Actually, I would say that it is inevitable. It's not just limited to PS. I had the same issues with
Coach and Balenciaga. When I carried Coach I actually did my own sealant repairs. I have since moved on to more expensive bags and would most likely turn that repair over to a professional. Because it's the handle...I wouldn't bother to repair it unless it was really noticeable and I could feel it while carrying it. A heavily cracked handle is a deal breaker for me when purchasing a pre-owned bag. However, yours doesn't sound like it is heavily cracked.
Anytime you list a "flaw" while selling, you will take a hit. If you aren't comfortable with listing it yourself then I would send it off to be consigned. Let them look the bag over and disclose any issues. You will be taking a loss by consigning...but you will be taking it anyway.