Just because you can sue a multinational corporation which has more cash on hand then the US government has doesn't mean you're going to get anything out of them - even if you win. According to a post on The Loop written by Jim Dalrymple:
“This settlement relates to a small number of customers who indicated that they experienced antenna or reception issues with their iPhone 4 and didn’t want to take advantage of a free case from Apple while it was being offered in 2010,” Apple spokeswoman Natalie Harrison told me on Saturday. The settlement gives users a free iPhone Bumper case or $15.
Let's look at this objectively for a moment. Under the program, you had the option of choosing cases from other manufacturers than Apple, if you didn't like their bumpers. Those that chose a class action suit against Apple actually lost ground, if you compare the result to what was offered previously. Under the settlement, those in the protected class have less of a choice in cases and their only option is to take a $15 cash buyout, which won't even buy you a case in any of Apple's retail stores.