Using tried and tested software to reduce time to market
If you haven't got the time or the budget to consider the development of a custom built application then ready built third-party software can prove to be a very useful head start.
However original your idea is, there is a strong chance that 80% of the functionality you require will match the feature set of a commercial application.
The remaining 20% can usually be developed to plug any gaps and differentiate your service offering from other users of the software.