Forged cranks, having the general shape of the finished product, need centering, cross drilling, do the hubs, snouts, crankpins and mains journals, and you're done, maybe some tuftriding and polishing
Billet cranks are labor intensive, being totally machined from a round bar , or billet blank, the diameter of which must be greater than the throws\counterbalances.
Would be my guess.
Now, about those billet door knobs, steering wheels and columns, mufflers, brake pedals, license plate brackets, etc...............
jd
'96 Dodge 3500HD cc 2wd drw............'89 GMC 3500 cc 4wd drw
5.9 12v #10TST 6sp SBC13-1.375.......6.5TD EFI maxEtorq v2.0 DSG
DODGE makes it CUMMINS shakes it.....4L80E 205 4.10 Dana60\70HD
6 in a row makes it go.......................Grandpa's big truck