Why are the NLHE FTP players scared?

[1tripz1]

I mean, i understand that they want to wait for the biggest fish so they have a huge edge blah blah, but what is the point of every heads up table having one person sat at. I mean they want to play, theres someone waiting, play. Most of the competition at this level is gonna be tricky anyway, if your just gonna sit there for hours you might aswell drop a few levels and play anything you can find.

And i only single out the NLHE players as it seems when the big PLO games are running everyone fights for a seat, whoever is playing.