My friend Heidi was a Theta legacy, and when she went through rush at LSU her mom got 48 Theta recs for her! Good thing she pledged Theta.
In most instances, it's not necessary to get multiple recommendation as the only people who will know how many recs were received are the Recruitment Chair, her adviser, and the committee. One rec is usually sufficient, and a few can't hurt but don't necessarily make a difference.