The main reason everybody does this on PO FR is because of the really fast levels and so such big blinds at relatively early stages. You'll rarely see this play at around 25 players still left, but once it gets to around 14 players just want to see cheap flops with not the strongest hands like kj or q10s or something; as they dont want to fold but dont want to shove when they can make the bubble. e.g. in lots of carbon tourneys at 15 players left blinds can be 250/500, and so a player with 5k will just limp with kj as there'll be others with 2k who they want to surpass to get to the bubble.