"LBR, why do you think that is?"
Practically no demand for it. I know some folks really like it, but in my opinion there are better options, like 62XS or Halo. Even if you pay retail, break it down and it costs...$1? $1.50 per string? Not a lot.
But, it's whatever you prefer. It's not hard to wind up an empty serving spool. I've got bunches of them if anyone needs one. I quit saving them--now I throw them away.
I've also got lots of serving material cheap--just shoot me an e-mail.
Chad