Boumtje23, maybe you should read what you link to. In case you didn't know, developers have to drink and eat too. Most of them even have to pay rent unless they're still living with mummy and daddy. Some people develop software in their free time, others do it for a living. "Open-Source" has absolutely nothing to do with gratis.

If someone offers software free of charge then be happy but don't be an *** just because someone requests payment for his work.