A lot of people get burned out of BLF after a while. It's fairly common with older users. When they stop coming here, it appears very sudden, much like what appears to have happened to Narkro555.
We can't really say that there's much of a connection between his "Brother's Gaming Addiction" post and his disappearance, if any at all, because we'd only really be assuming.
My guess is that he just stopped coming.