Stability Since you can rely on anyone and since the license states that any modifications shipped elsewhere should be equally open, this means that after a period of time Open Source software is more stable then most commercially distributed software. This solves vendor lock-in situations which ties your hands and knees to one and only one vendor if you choose one's products. Quality Not only does software evolve onto a stable product, a large userbase also supplies new possibilities, making it a feature-rich solution. Innovation Competition is what drives innovation and Open Source keeps competition alive. As noone has any unfair advantages, everybody has the possibility to add value and provide services.
Information wants to be free.
It is widely known that security by obscurity is not a secure practice in the long run. By opening the code and by wide adoption of Open Source software, it grows more secure. Generally, new Open Source projects tend to be insecure, but once a project matures and becomes production-ready, it is more reliable and more secure than most available commercial software. Although Open Source doesn't necessarily mean that it doesn't cost a dime. This allows us to cut down in price and spend more time to create more secure and adapted solutions than commercial consultancy firms.