Often expanding the employee count also means expanding the office space to hold more employees. The cost of upgrading and expanding a space is saved by delegating some of the work to online employees. This allows the employers to save time and money searching for a new space and also gives them the access to many talented employees who may not be available to work the typical 9-5 hours.
If you truly desire your company to go global, then it must be online all hours of the day. If speed is of the essence of your business, you can capitalize different time zones by delegating work according to individual time zones. When you have a business that is ready to serve customers 24 hours a day, 7 days a week, it won't take long for you to expand.
I doubt many companies like or prefer that employees work from home. We allow the policy in order to be able to attract employees who would otherwise go elsewhere. We are heavy users of Slack, Confluence and other collaboration tools that make working at home more productive, but they cannot replace the serendipitous interactions that occur while hanging out by the nitro-coffee keg. - Manuel Vellon, Level 11