I'd guess it's them. Everywhere else, the system is set up to place as many women as possible. Most placement rates (even at the SEC schools like Bama, Ole Miss, etc) are in the 90% or above range.
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"Remember that apathy has no place in our Sorority." - Kelly Jo Karnes, Pi
Here's a quote from the 1978 Arkansas Razorback (yearbook):
"Bid Day meant more disappointments than usual as 623 women competed for only 264 spots."
Arkansas had bed rush back in the day. I will never, ever see what the reasoning is behind it. If recruitment numbers are high, why should everyone need to live in the house?