Being honest here, nothing sells on kingsnake anymore, I mean I'm sure some people get lucky with their stuff, but my ads on kingsnake get zero replies a week compared to every/any other site.... BUT I also have a reptile report marketplace account and not only have I never sold an animal there, my ads also have way less than normal views after months of being placed. Leading me to believe that the only people looking at TRR market site are sellers, no buyers. When I post the same stuff on fauna it's a completely different story, but it also depends on if you are selling what the people want. I also think kingsnake.com has a problem with it's email system, as I have sent emails to people for stuff I wanted to purchase, only to never get a reply, and then whenever I get around to contacting them a different way (direct email, phone) they say they never got an email from me. Could have something to do with it, who knows. Your best bet is to have a presence on every site.
The classifieds on Kingsnake go to spam folders. When I send an e-mail using their system I always have to check my spam folder for the breeder's reply.