It could be that if a chapter were to get set up at a 2 year college, the membership would turn over quite quickly, as all the students in the chapter would only be around as collegian members for 2 years. You would be a pledge in the first year, and then the 2nd year, you could feasibly be president. It might be that 2 years is such a short time, that it could make the recruiting and retention of members quite volatile, as people would be gone (as actives, that is) after 2 years. Also, I am not sure of the economics, but it is better economomically if for the National if their members are paying for 4 years of "active" membership and not only 2. Tell you what: Perhaps you could write to the HQ of whichever group is of interest to you and ask them why this is so? You may get a response back and who knows, they might re-examine their policy on the 2 year vs. 4 year college policy. Good Luck!