Only read the 1st page, so forgive if I missed anything that's repeated already.

Well, I don't know all too much about Thai Gods and such, but my mom is Thai and shes a faithful believer/worshiper, so if there are any specifics, just hit me with a PM and I could forward the question to her.

There is one thing she mentioned to me before - not to offer something in return if you wish/pray for something. Mom and her friends told me various true stories how people wished for something and said they would do something in return if their wish came true. But they didn't and some bad karma, omen.. etc, befell on them.

Like there was one where this woman prayed to strike on the lottery and would dance in the nude for the God if she won. She did win.. but didn't dance at all. Then she got into some vehicle accident and something after that I can't recall. And I think she went to consult with a monk about it and was told she needs to fulfill her promise. So she went back to the praying spot and got people to fence it up and did her dance and things went back to normal