The last time I got a playing guide was for a Gamecube pokemon game that had XD in its title. Honestly I never used it since then. I prefer to play games as blind as possible. Especially if its from a developer I trust. I have a bad of habit of looking ahead to "prepare " what going to happen only to spoil everything.
So no I don't buy guides. I very rarely use internet ones expect for some old games like NES Final Fantasy games or Ultima.