"The Final Fantasy XIII demo sold, and sold well. It sold to the tune of... well, I'm not exactly sure. The Advent Children Blu-ray sold 275,000 units according to Media Create, but it's unclear how many of those were of the FFXIII bundle, which costs an additional 1,000 yen.
The Monster Hunter 3 demo, bundled with Monster Hunter G, has a lot of work to do if it's going to reach that lofty height. But it appears to be off to a somewhat good start, according to the always reliable Sinobi blog.
According to the blog, Monster Hunter G sold a total of 92,000 copies in its first day of sales this past week. This figure was split 65,000 for the Starter Pack which bundles in that sweet blue Classic Controller, and 27,000 for the standalone version of the game."