I think that's because most of it is not newsworthy. Some of it might be, and that's why it's important for it to be there for the public and for journalists to see. I would never suggest that every airline ticket is going to be a news item.
The answer to your question is simply that there aren't a lot of news stories about expenses, relatively speaking, compared to the amount of information that's out there, because most of it is not extremely newsworthy. If it is newsworthy, it's our judgment in newsrooms to publish it.