What does it mean when your opponent calls/raises PREFLOP?

[Me and You]

I'm with Bodi not very many lower limit players will fold to a raise when they have already called. Therefore limp get lots of callers hopefully someone will raise more callers and when it comes to you reraise more callers. By this stage you have 5 or 6 players each with 3 bets in the pot. Now what you really want is for the original raiser to cap and here we go again. All of a sudden you nail your hand on the flop and win 100BB

It is a bit of an exageration but this is why I believe most players do it.