They've made a name for themselves in the gaming industry so people have come to associate their branding with quality...simple as that.
90% of people who've played both persona 4 and final fantasy 12 would tell you that persona 4 is the better game. However, FF would stay at the helm of the JRPG scene because squaresoft has successfully associated the FF name with quality over the years. Back in the day, I'd buy any RPG game with squaresoft on the box until they started to falter.
Many people hold the same faith in nintendo that I used to hold in the old squaresoft (a faith I now hold in only FF games from S-E). Perhaps this is the reason nintendo won't gamble by publishing titles they are unsure of (think of the conduit and Winter) so they don't risk damaging their image like S-E has done.
"Dr. Tenma, according to you, lives are equal. That's why I live today. But you must have realised it by now...the only thing people are equal in is death"---Johann Liebert (MONSTER)
"WAR is a racket. It always has been.
It is possibly the oldest, easily the most profitable, surely the most vicious. It is the only one international in scope. It is the only one in which the profits are reckoned in dollars and the losses in lives"---Maj. Gen. Smedley Butler
