This is sheer speculation, but I do think the hotel business is really convenient to get into if you have a questionable side-business and need to launder money. Who is to say if a room was occupied or not that night, if that foreigner who paid in cash really existed. Can pretty much just trickle money into the books. I imagine you could also run contraband out of them fairly easily. Lots of people coming and going with all sorts of luggage. Who is to say if they are as full when they leave as they were when they arrived? Great for prostitution too, trafficking. The girls can tidy up the rooms during the day.