Too exciting or too lucrative?

Why would you abandon an audience of millions for an audience of five people and a dog? The BBC reports:

BBC newsreader Natasha Kaplinsky is leaving the corporation to join commercial broadcaster Five.
She will join the channel in the New Year and replaces Kirsty Young, who left Five News in the summer.
"After five incredibly rewarding years at the BBC, I found the chance to work with the team at Five too exciting to pass up," Kaplinsky said.

Nothing to do with the money, then? The Guardian says it's between £400,000 and £500,000 per year.