Many repeat Kickstarters get very quick surges when they launch. They usually send a blast out to supporters of the first Kickstarter, so they have a captive list of hot leads ready to go. (This shows the power of email lists btw)
Also,I believe the media is more eager to cover them, as it is bigger news when a past KS success launches follow-up projects, as opposed to an unknown launching a new project.
Edit: After I wrote this comment it already had $39,000.