Wow alot of people have said things that hit close to home

But I'll post some regardless
1.
Letter Wearers, Letter Wearers, Letter Wearers! 
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DO NOT be showing up at the event with the most expensive para on, knowing D*mn well you had ish to do with the planning and execution of the event! Having the most para does not make you member of the year, so don't even
2. Not respecting those that came before you-Recognize what people had to sacrifice to pledge you and educate you about the org, do not come into the chapter/org thinknig well they need me so I'll act anyway I want with em, sorry it ain't going to cut it.
3. 'False' Prophytes-Those who act all hardcore when they're pledging you, want you to do the most insane stuff...then you find out how they were while pledging, the complete opposite of what they're expecting
4. Cliques in chapters/regions-It happens in every org, non-greek and greek, but folks should be able to recognize that the members (for the most part) pledged for the same reason(s), do not be using your friendships within the chapter/region/org to get at another member...when meetings start sounding like a "Survivor" Tribal Council debriefing, then you got problems!
5. Sticking to only a certain type of people-Please, it looks real bad, if you only hang out with a certain sorority/fraternity and only befriend potential interests, communicate with all Greek and Non-Greek orgs on campus, show them you're easy to work with.
6. Choose your business time accordingly-I've been a member of a Registered Student Org longer than I have my fraternity, one recurring practice is folks show up to an RSO's meeting and make it all about XYZ, do not turn it into a mini-informational (not everyone wants to hear it); also do not just show up just to recruit folks and we never see them again until they have become members of your org only to continue the cycle.
7. Folks who have no life outside of Greek Life!-Don't make the org your life! Contribute to it and don't just take, you can contribute by joining other civil/social orgs! If I call you up just to see what's up, don't talk Greek business unless I need to know it! If you cannot carry a conversation about something not pertinent to Greek Life, clearly you must work on your social skills
8. Give respect where respect is due-I learned this in a leadership workshop, a simple pat on the back and 'good job' to a contributing member will keep him/her going even if they are burned out! Do not push him/her to the side because they may not know how to say 'no', this will ultimately push them away and the results will show who has actually been doing the work!
9. Be Social, but don't make that the only thing your org is about-You can throw as many parties as you want and think 'Hey everyone knows us we're good' but if you haven't done any service or non-social events, then you've done nothing except what most college kids do...piggybacking, I cannot stand when you can't get a hold of folks to attend a decently timed event...but tell em you have party and people go the extra mile to be there