This guide work.
Period.
I've played since Beta but never bothered with making money of the marked.
Usually I just dropped unused recipes but buying and trading for profit was never something I could be bothered to do.
Until I created my latest alt.
Imstead of bankrolling her with richer toons I gave this guide a read and with just 10 minutes of "work" when logging in or before logging off and the simplest proces of buy, craft, convert, sell means my alt is entirely decked out in Enhancements and has over 1 billion influences.
If I was inclined to really work at the trickier aspects of the trade I could likely get far higher profit than I do, but I dont find it necesary.
So thanks for a great guide.