Off the top of my head I guess one might want to sue an online gaming company over bans they feel weren't justified because as far as I know getting banned in one game means you can't play online any other game that uses VAC2. And they could have a case if the ban really wasn't justified.
Or, as I said before, some shady business with refunds if a developer left Steam with all their games that you paid for and Valve wouldn't give you what you expect/deserve.