At last weekend's card show, I refused to sell one of my cards at below comps. CL and ALT value had it at $414. I asked for $415, and he was pretty mad when I would not accept $390.
Today's value, six days later, is $438.
I'm learning more, as a semi casual seller, that it's totally fine to not feel like I have to cave to "comps" or frankly, move off of a card that I just don't want to. Gut check, in check.