The size of the senior classes in the NPC groups is visible to the general population of a campus. Penn is a campus where it's not necessarily "cool" to be involved with an NPC chapter as an upperclassman, and especially not as a senior. 90% is, of course, an exaggeration, but there has been a retention problem at that campus for a long time. Most non-officers never live in the houses, and the Penn network is so fantastic that the lifetime-membership aspect is not a big part of the sell.
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