Damages are for a court to decide. To be sure, EULAs and licenses may contain boilerplate specifying violation penalties but it doesn't necessarily follow that they can be enforced. One of the design goals of the GPL is to be valid in as many jurisdictions as possible. Including a damages cause would weaken that. It may be contrary to it's designers' strategies as well. Both the SFLC and FSF have said that most GPL violations are resolved quietly.