There IS no ’saving money’ making them yourself. Just a different sound, maybe.
When you are not buying $2,000 power cables, but DIY'ing for $100, you are saving money. :)
But you are right in that it is difficult to take a DH Labs cable and make the exact same cable they do for less. However, buying Connex (Parts Connexion) connectors you can actually save a little, plus the ability to make custom lengths can be really convenient.