I have lived and worked in Thailand since 1975. Some of Synthias comments are valid but she seems a little too strong on some for me to agree.

For example: 1/ Many expats will tell you that you cannot own a property in Thailand other than through your spouse, or a condo. I disagree. I own companies in Thailand that own properties. I am happy to talk to you about this in detail if you would like to meet. I am not interested in getting into a drawn out discussion on this thread about the hows and whys. But please trust me, it is not simple and straight forward, but yes you can.
2/ Yes you can. Many foriegners do get taken to the cleaners, but there are simple ways to guard your income that are not difficult, and still have Thais share your business.
6/ My businesses were started before I had a Thai spouse and they are valid, profitable and viable. They have not been copied (yet). But in general I would agree with Synthia on this point.