i'm guessing the reasoning behind the minimum raise from a late position against several callers is to induce a reraise from another player and then go all in with AA or KK. or maybe the player just wants to juice up the pot and doesn't want to lose too many people. it may even be possible that the players are making the min. raise to look weak (not a good idea IMO) or they are raising with complete drawing hands like JTs. these are just some things i could think of that would explain these reasons, and i do not necessarily condone them. it depends on who your opponents are.