It's bloody annoying and is generally only done where the singer thinks the song isn't long enough. In other words, they feel they've waited quite long enough in the singaround and now it's their turn to have a fair crack of the whip. Thanks, but if you told the story with the existing verses, repeating the first ain't gonna add nuffin' to it.

CTTOI, if you're next in the queue, try singing the longest version of any ballad you can think of and throw in a repeat of the first verse. I guarantee, your first verse repeater will be the first to moan.