Noiz2
Sound Ninja
When you below the union scale gigs the market is very variable. In a big market you probably have folks under employed and $150 is better than $0. It really depends. I've done gigs at that level between gigs that payed $650/ day. In this economy there are, I am sure, some very good deals to be had. Plus low budget films almost never pay close to the "going rate" for commercial work.$150 a day sounds like a gift if they have any skills/equipment at all.
So your right it is a bit of a gift, but one that can be had. And as I said that is what producers are for. If your cooling your heels and a producer can't convince you that it's in your interest to help out on their film, well you need a better producer.