The one thing? I'm already thrilled about Hub Pages, I love being able to use their interface to:
Gather a captive and captivating audience.
Put across my ideas and gain immediate feedback from what I've written.
Improve my writing and presentation skills.
Read hundreds of interesting articles a week written by fellow Hub Page authors.
It's awesome that I make money from it, but let's face it, the other benefits are what make me want to be an active member of this community. The money is peanuts, until the payout hits ... ;)