Since no one else has replied ....
I would think the daily rate for a piston Malibu would be very close to the Navaho, and around here (Southeast) the Navaho pays from $200 - $300 per day plus expenses, depending on how much Navaho PIC time you have, as near as I can tell (a friend with 4000+ Navaho hours makes $300 per day).
It'd be nice to know about the Malibu, specifically, though. Because there are a couple of them around my neck of the woods flown for mfg. companies, Part 91, and I'd love to get in one when I have the hours.
Minh