it is the wrong part of the forum and should really be in the hardware section. but often people like waving there internet penis with whoops of joy. i dont blame em if they build it themselves as its a cood feeling to put something together from parts, turn it on and not hear a bang.
if there gamers then i see no harm in showing off in the games section as long as its not a MINE IS BETTER THAN YOURS! post. it also give us the opportunity to critique systems that would normally be buried in other parts of the forum we dont use.
its also nice to see how happy users are when they ask for advice, take it and come back to show the end result.
so i say no harm, no foul. as long as they aint being a prat i have no problem with it.