Konami should have focused on other gaming websites to promote suikoden. In my opinion Konami would not achieve its goal of expanding the fanbase by adverting on suikosource/suikox, which are mostly visited by fans. Gaming forums such as NeoGAF and RPGFan are better suited to attract new fans to the series.
I do agree with the notion that Konami should put far more efforts into marketing it through general gaming sites to touch larger gamer population, but them approaching specific fansites probably have more to do with the fact that Suikoden Tiekreis breaks away from almost all established conventions of the series, potentially leading to alienating a good amount of their already "loyal" fans.
I'm not surprised. Last time they set up an official fansite for Suikoden and a handful other RPG series with a hefty amount of goodies given out to generate activities, but it was unceremoniously shut down without much explanation not too long after. Sad.