This is hard to answer, because in reality each vendor is different and a few variables come into play.
If you look like a tourist or a bit clueless, or rich, the initial asking price will be higher.
If the market is geared towards tourists, the asking price will be higher and the expected bargaining counter offer will be lower.
The more local you are/look/behave, the lower the asking price will be, which also means countering with a 30% offer will be insultingly low. If you speak the local dialect fluently you will receive a lower asking price. If you speak Central Thai fluently, you will be asked a little more.
Hopefully that works to understand what comes into it.
If I recall correcrly was developed by a Japanese investor, intended to be an Onsen type spa and there has been very drawn out legal disputes regarding that place.
If part of what you have in your carry on is clothes wear it on your body. And fill the pockets. It may look a little silly but better than paying 2000..
Nobody can say with any certainty what can be done when greasing the wheels. Since you don't really seem to want to stay anyway, I would think your plan to pay your overstay fine and leave sounds like the best option right now.
Essentially, these days, to make things easier, just consider your passport validity to be 6 months less than it says it is.
It is easiest to just change it for a new one before you reach those final 6 months.
Many countries and airlines (who are held responsible for any issues with stranded travelers they have allowed to board) now apply the "minimum 6 months left" rule for entry.
You can still return straight to the *home country of your passport* after those final 6 months of validity, but any stops/layovers that require you to temporarily enter a third country may be a problem depending on the policies of the airllne and that third country.
Going without health insurance is a very dodgy proposition unless, of course, you happen to be sitting on a literal neverending pile of gold.
When people get admitted for serious conditions, their bills can tick up into the millions of baht.
I have seen it happen to acquaintances, and as a result, their loved ones' finances ruined until there was no more money left, and no choice but to pull the plug.
Heartbreakingly sad, and avoidable. Don't wing it.
Slightly rude to reply that curtly to somebody who is trying to help, even if they misunderstood what you were trying to say.
To make sure everyone understands, we need you to clarify what you mean by "border run".
Standard terms are "border bounce" and "visa run". "Border bounce" means leaving the country and going straight back in, and "visa run" means crossing the border and going to a consulate or embassy in another country to apply for a new visa.
This is how I understand your situation. You used up your 60 day tourist visa and extended it by 30 days in country. Now you want to know how many days you will get if you cross the border and go straight back in - "border bounce".
The answer is you will get a 30 day permission to stay based on a "visa exempt stamp" IF your nationality qualifies for it.
Other conditions apply if you are not from a country that qualifies for a 30 day visa exempt stamp.