To put it in perspective, this is less than what Microsoft paid for PowerSet ($100 million for a search engine), Farecast ($112 million for a airfare pricing comparision tool) or less than what Google paid for FeedBurner ($100 million for a RSS reader).
The satellite plans to do a detailed mapping of the entire lunar surface. If a web startup built an application in the lines of Google Maps using these mappings that would probably sell for more than $78 million, more than the whole cost of the Moon mission. Bit if an exaggeration but you get the point.