I'd point out that the best jacklines are probably 1/4" or 5/16" spectra core-line with tubular webbing over it... the webbing acts as chafe and UV protection and also serves to make the jacklines easily identifiable under any conditions. THe webbing also makes it less likely to roll underfoot.
Yeah, over $2 per foot v.s. $.30 per foot with same result and same strength.
What's the point?