I do in part @Surfside. I don't know the logistics of a donation vs. reward fund but, if that was clarified early on, some of the money collected from donations/fund raisers could have been put to good use. LE can't possibly fund an all-and-out search effort for very long. Their resources are limited and the cost is high for manpower alone. Just look at the recent report stating that they have spent $40k so far on the case.
I was a big proponent of hiring a PI early on. That time has come and gone. Maybe it could have helped break the case or not. But, we'll never know. At least that effort would have been made.
And, if it were my child, I would have let the psychics, voo-doo witch doctors, and clairvoyants offer up their services without question or doubt.
Not passing judgement on the E's. Just stating what I would have done and used the money for since no one has come forward with any tip worthy of the "reward money".