Generally speaking, yes. So long as one leaves Wriggle Room.
I've been in intermittent contact with a CAF'er for years now over a NFS piece he -fairly- recently purchased in the $100-$200 range. Our last conversation ended with him floating the idea of selling somewhere in the $1,500 range, "but even then, I might still say 'no'"
I thought that communication was generally fair, giving me a target price which might be considered, but still not committing to a sale. I did not feel slighted by the extreme increase in expectations (as the piece has been framed), but the result was a respectful quieting of communication, which was probably the intent anyway.
I also felt the communication was possibly instructive as a possible way forward should I ever be in his shoes. He was upfront about his warning of Not Committing to Anything, which I maintain is fair.