Without signing your post, it indicates to me that (one or more of the below):
a) You are not willing to take any kind of ownership or responsibility for the comments you are making
b) You don't want to be associated with the comments you are making
c) Your comments are not credible, therefore you don't want your name attached.
d) Your comments are inflammatory, deragatory or impudent to the extent of being discourteous of others.

To establish credibility within the Pure Baseball community and have your comments accepted, simply sign your posts. Not soing so indicates a nefarious attitude.