Hi Iuda,
thank you for your interest in wpDiscuz addons. This price has some reasons. It includes:
1. Addon development and updates
2. Addon premium support and quick bug fix
3. A small donation to the hard work wpDiscuz developers do about two years for free. When you buy an addon, you also donate the free wpDiscuz development and support. Addons are the only incoming source for wpDiscuz developers. Addons are not required, wpDiscuz has already dozens of free built-in features which could also be addons, but those are available for free with wpDiscuz core.
