If you're first into the pot with kings or aces for a raise, you'll usually get called by phenominally weak hands on the basis that it's 6 handed. I've seen a raise my pocket kings to be called by k j off and the miracle flop of k j x comes and I get paid off instantly. And it's very common place to get paid off when A-face pairs his face card and calls a large/AI bet with TPTK.

Also, if other players have 99-jj they may not pay you off, but you'll surely be protecting your hands and you'll still make money from the preflop call (which i usually make very large, in the 4-5 dollar range at 25 max buyin).

I just don't like limping and praying for a raise becuase If none comes, you may accidentally lay down to big bets on the flop when someone makes TPTK missreading them for 2pair or better. Or worse, pay off low cards that do make 2 pair and play them well.

-'rilla