I personally think it is rude to not respond to voice mails, emails, or other invitations. It it so hard to say "Thanks but no thanks" ? I think ignoring someone attempting to contact your group (and as an appointed or elected officer we represent our whole groups at times, particularly on a college campus) is uncouth and tacky.

Is your chapter small? My campus has a few fraternities that simply don't have enough members to socialize with. If all 25 of their members show up and a third of our 140 do, the ratio is still all wrong. And since the quota/total system means sororities are usually around the same size, that might make you feel "blacklisted." Just a thought.

It would be GREAT if you started showing up in large numbers to support sorority philanthropies. It's so frustrating to spend all that time on an event for a cause we really care about only to find that all of our "friends" in Greek life had better things to do that day.