Because the guys here are the best support you'll ever find when it comes to computer problems, and service like they offer for FREE costs alot of money if you go to someone that gets paid for it 
Also, it's fun, we've got 
STAAAAAAAAATS, we race, we joke and generally have fun 

 Did I mention the STAAAAAAAAAAAAAAAAAAAAAATS? 
Oh and what Wolfie said, if you want your computer to run like a finely tuned race car, as opposed to the slug that it is at the moment (figuratively speaking

) there is no better way to get it tuned up and ready to FLY than to ask us for advice when you want higher output 
Just my $0.02 of course 
With love and respect your wannaBe fellow TA member
 
Two-Face
My stats:
RC5
OGR-25
Seti
Gamma Flux