Maybe Groupon will be able to get a volume discount on legal services
Groupon may have rather more legal woes than people generally think. The problem isn't particularly that it's doing anything wrong - it's that the major limitation on most innovation is the old way of doing things. In this case, that's the laws about the old ways of distributing and using coupons.
Research from Harvard seems to show that Groupon and similar sites are at least in danger of being in breach of the various consumer protection laws that have been passed over the years to protect users of the old coupon distribution systems like newspapers and flyers. The research identifies seven major areas in which what is currently on offer does not match up with what is required.