agreed with robert on this one. who really knows?
could be you have less than stellar photos.
could be you don't have enough credits.
could be you are trying to do a mailing at the tail end of the busiest audition season in NYC and agents are busy as heck confirming jobs and contracts for their current clients. maybe wait until may or june and do another mailing or a follow-up. their clients are heading out of town, they'll be rethinking their current client list, they'll be not quite as busy.
could be you are of a highly populated type (specifically those in the 14-25 yr old caucasian- which is always my problem) so unless you have an amazing headshot, a referal, or some awesome credits, you will probably get looked over if you are in that category.
could be a million other things. maybe you trained a place that the agent hates. maybe agent saw one of the films you did and didn't like it. could be that they love you but don't have a spot for you right now.
these other people having luck could be in a much less populated type, could be that they really did their research and knew who to contact. could be that they have awesome credits and matching headshot.
who knows? just keep trying
