Jim Weir writes:

I've got a stupid question. Why would somebody use silver-plated copper coated
steel coax with teflon dielectric at about a buck a foot RG-142 when any decent
active antenna will drive 50' of nickel a foot and no magnetic errors RG-174?

Same reason people will buy this:

http://www.stereotimes.com/cables071003.shtm

-jav