![Image](http://i23.servimg.com/u/f23/16/33/05/42/52623610.jpg)
Reason? Cause Pandora Hearts is the best Manga, and probably the best story, ever. Period. Of course, I'm not the only one who thinks so.
But seriously speaking: It's an incredibly popular manga with a huge and fanatical following (that's well deserved, because the story is truly amazing). Like all fanatical addicts, these people will do anything to get their next hit of PH. Translating the light novel will expose this huge mass of people to the light novel scene and since manga readers are the easiest to convert (since manga is more or less reading already), it'll be a good way to increase the light novel community. Think about it as providing the gateway drug, you lure them in with PH, then you give them a little HakoMari and then bam, chronic dependence.
It's not a lot of work either because it's only a single novel with 4 individual stories, so the work can be easily compartmentalized.
And if you haven't read Pandora Hearts yet, I highly suggest you do so. I don't know a single person who has read the first 3 volumes and not finished the entire series (up to its current point) cause the story is disgustingly good.