For newer members that may not be familiar with our resident trolls... we don't give out infractions (which, by themselves, really aren't a big deal to begin with) for something silly like posting "yawn". Yoko's infraction was for spamming a bunch of threads. The infraction came after he ignored a warning from another mod.
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Most likely he was just trying to get his post count up to get around the forum's anti-troll/anti-spam protection.