well, you put the # of hours you volunteered, positions held, and general description in pharmcas anyway. Putting "AED -- member. x number hours" is eh...but putting "Flying Sams -- vice president. 2x number hours. listing all the things you did..." will look a hell of a lot better, and it won't run you $$$ in fees.
If you're gonna go greek...join a real fraternity with real standards, not the fake pre-health ones with pretend standards that anyone with half a brain and no social skills can complete.