Yea, and all of us that want to drive fast would buy a Lamborghini. Sometimes it isn't in the budget. I'd like to see what kind of HT setup you'd build for $300.
Just as a side note...if I only had $300 to spend on an HT sound system I would get something along the lines of the Kenwood HTB-505 It won't blow anyone away, but it's a great starter system for someone on a budget and would almost certainly blow away any PC speakers.