Hi, welcome to NamePros! Don't be discouraged -- it happens to everyone, including me. I'd say at least half of the domains I post for an appraisal never get a reply. You just have to be patient and realize that there aren't a whole lot of people who feel like they can give decent appraisals. The ones who can are often busy or just don't see your post right away. And, quite often, an appraiser won't comment if it isn't a domain that strikes a nerve with them. I give appraisals on occasion when a name jumps out at me. Run of the mill names often go unnoticed.
So if you don't get an appraisal right away, bump your thread once every 24 hours if you'd like, and eventually someone will take notice.
Good luck!