Help! should I buy this guide or not?

[meteor]

hello and happy new year to everyone

in 2007 I have find out an guide for SL the:Second Life Linden Dollars Guide

http://www.killerguides.com/guide/second-life/linden-dollars

my question is very easy, have any one buy and use this guide before? or have you here

somebody have buy and use this guide before?

Is it uesful or not (can it still work in 2009 in SL?)

thanks for helping.

meteor.