Sending the entire company to a distant location for a month only works if none of your employees have responsibilities outside of work. If you have children, or are caring for an elderly parent, or even if you have a significant other who you don't want to be away from for a month, it doesn't work out so well.
I like my co-workers, but I also like getting away from them at nights and on weekends. My co-workers are not my family.