Packard's gang had to be into something more than pinks
Packard had a huge barn stocked with a full service chop shop, which was seemingly self-serving for himself and the gang. This costs money, much more than just jacking a few townies for their used cars could net.
There is no evidence in the film that Packard is dealing drugs or weapons, or even dealing in stolen vehicles. Where are they getting all the money needed to supply the chop shop, eat, buy fuel, etc...?