I found the article (thank you google) that mentioned Cobra leaving when the money runs out:
(Bolding mine)
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SATSUMA, FL -- The neighborhood where Haleigh Cummings lived and disappeared has returned back to normal.
But there is one man very visibly and actively out searching the area, a private investigator and bounty hunter from Miami who goes by the name of "Cobra."
William "Cobra" Staubs has been in Satsuma for more than a week. He is searching woods on his own and following up on leads. He says he is making progress.
"Investigators have five weeks working on this, I've had one week and I've caught up...now I have to connect all the dots," says Cobra.
Cobra visited the home of an accused sex offender Friday, and earlier in the week he asked Ronald Cummings and Misty Croslin Cummings to re-enact the night Haleigh disappeared.
Cobra is paid partly by an anonymous donor in Miami. He says he will stay in Satsuma until his money runs out.
Also Friday, the Putnam County Sheriff's office told First Coast News that deputies were involved in looking into allegations of child abuse or neglect by Ronald Cummings three times in the last four years.
Found here: http://m.firstcoastnews.com/news.jsp?key=173512&rc=fl_lo
None of the incidents led to criminal charges.