There's a lot to be said in favor of having a hand in building your speakers (or amps for that matter). The knowledge gained and appreciation for what makes them work is priceless for life. Plus, as was mentioned previously it opens the door for picking your caps, resistors, inductors, connectors, wires, and insulation. The pride factor ain't too shabby either!

The DIY can often yield the most product for the money too. You skip the dealer markup, and get better basic parts for the money. Resale is a different matter, but the initial purchase tends to be better....with due diligence of course.