Do you speak Thai Mike, can you read and write the language? If not you probably wouldn't know what they are talking about most of the time anyway. And you are not the only long term foreigner in Thailand or the only one with a Thai wife, far from it. You shouldn't suppose that you know everything it just comes across as completely ignorant. I'm not wasting anymore of my time on you,typical boofhead.
clearly you don't know that much about it Mike despite your 20 yrs. At the end of the day, a person will pay whatever they are comfortable with and negotiation is based on various factors
Says you. A good friend of mine paid a substantial dowry for his 25 yr old Thai bride from a well-to-do family whose parents insisted she was a virgin. May not be discussed in your culture but it is in many others
Don't pay any sin sod if it's not a thing in your culture. I'd consider it only if the wife to be was a virgin, never married with no kids from a decent and proper family.
You wont have a problem renting any car or any motorcycle without a licence in Thailand. Many Thais are also getting around on the roads without one. This doesn't mean you should.