Advantages number 1 and number 6 somehow overlap each other and like Jet Cash stated, your mentioned advantages are mostly merit and signature campaign focused. A clear advantage that I see from myself is that my English and writing skills improved a lot since I dedicated to constructive/ quality posts. English is not my first language. Before putting effort on constructiveness, I could produce 1, 2-line posts only. But my vocabulary range, grammar structures and writing style positively changed since then. Although I have to admit that my initial goal was to get merit and join quality campaign but improving my English is the thing that I'm most appreciated.