I like LasVegas.Cleaning for two reasons.
One of which is the branded example you provided. Tips and tricks on how to beat the casinos, and what do you know? There are a ton of monetizing options for that (Amazon for books, eBooks, rev share for online gambling, etc.) in addition to enabling 'Gambling' enabled on AdSense.
The second approach is well, house cleaning. It's a pretty big business for maids to come by and they charge a pretty penny. There are a lot of homes in the outer Las Vegas area that do get serviced, because they are rich. Doesn't just limit you to that either, pool cleaning as well.
Good luck.