Thread:Roboartitec/@comment-3390396-20130904160033/@comment-3544775-20130904181726

In short: Promotion. Having your logo on another wiki may get noticed by other people who either didn't knew of the series or didn't knew the series had a wiki. Spotlights also do the same thing. It may not be a 100% sure thing to bring new people, but still gives some chances (the more wikis, the better) and it's not big deal to have such template on the main page. Affiliated is like: this is good wiki, give them a visit or something.