Using the SaaS model, it is relatively easy to sell into foriegn markets without being physically present in those markets. A SaaS company can therefore expand internationally much earlier and much more quickly than was possible in the on-premises world.
However, to support foreign customers it is usually necessary to engineer an application for International use. This requires stronger application design and development skills, than for native language applications. Ideally, everything in the application should be internationalized, including the Application, warning messages, help files and even instructional videos.
There are also people issues, such as locating people to offer support on a 'follow-the-sun' basis and also having appropriate spoken/written language support. Sometimes local partners can be utilized to provide the appropriate support in International markets, during daylight hours and at local pay rates.