Jig heads are cheap on line. I just ordered 50 in one weight for $12.50 s/h included. You can buy them in all weghts and hook size combinations. I'd have a lot harder time getting my creations to work if it wasn't for being able to match a jig to body size and shape.
The jig is the primary component of the lures I catch fish with.

The thing about lure craft is finding what gets bit and maybe why - all having to do with lure action.