In general speaking, there are 2 types of Feng Shui practices in the market.
The first one is what we call Classical Feng Shui. Classical Feng Shui uses methods and techniques that focus on how to harness the Good Qi or energy from the environment as well as inside the property to support your health, wealth, and relationship aspects of the occupants. The formulas used are documented in Classical Feng Shui text with roots that can be traced back to Ancient China and have a very long history. The focus is on the location and direction of the property as well as placement of key furniture inside the property that will have significant impact on the occupants. There is no need to purchase anything costly from the master to enhance the Feng Shui of the property. All can be easily obtain and cheap.
The second is what we termed as New Age or modern Feng Shui. New Age Feng Shui relies on the selling of products to their clients and depends largely on using psychological motivation through displaying of Feng Shui ornaments as Feng Shui cure. If the Feng Shui of a house is very bad, this can be dangerous because this does not alter or change the Feng Shui of the house in any way. Hence the problems remain and act as a ticking time bomb, ready to ignite and explode when the time is up.
Cheers