No, you need that 80k to argue that Groupon's proposed product would infringe your trademark. US trademarks are only good for the line of business I'm in. If

No, you need that 80k to argue that Groupon's proposed product would infringe your trademark. US trademarks are only good for the line of business I'm in. If I were to publish a software product called Mustang, for example, Ford wouldn't be able to sue me for copyright infringement. My product shares a trademark with one of theirs, but it's in a different enough market that the two trademarks don't conflict with each other. It sounds like Groupon's proposed product is point of sale hardware. That's different enough from a desktop window manager that Groupon can quite possibly get a lawyer to convince a jury that they're different businesses. Therefore GNOME Foundation has to pay a lawyer to stand up and argue the other side of the case.