In a response to a question on Quora titled “Why is Dropbox more popular than other tools with similar functionality?”, Isaac Hall, co-founder of Syncplicity, a competing service you’ve probably never heard of, explains:
In the end, it really came down to one incredibly genius idea: Dropbox limited its feature set on purpose. It had one folder and that folder always synced without any issues – it was magic. Syncplicity could sync every folder on your computer until you hit our quota. (Unfortunately, that feature was used to synchronize C:\Windows\ for dozens of users – doh!) Our company had too many features and this created confusion amongst our customer base. This in turn led to enough customer support issues that we couldn’t innovate on the product, we were too busy fixing things.
He then goes on to provide some great advice:
If you’re starting a new company, the best thing you can do is keep your feature set small and focused. Do one thing as best as you possibly can. Your users will beg and beg for more functionality. They will tell you their problems and ask you to fix it. My philosophy is that they’re right if their feature request is right only if it works for 80% of your customers. Until you have a lot of resources, stay focused on your core competency.