A very nice and satisfying reply you gave "The Red Queen"
As I stated(and people from the forums in the links I gave) oaths do not always represent the lawful good alignment and in the same way the oath of the ancients represent more something like the balance of nature (like a true druid should). So by betraying that oath it does not automatically make you a servant of darkness and evil.
I also like the oath systems and the oathbreaker class, and I suggest Larian to not delete that subclass, but only to add another subclass the "blackguard" which in my opinion is more like the traditional evil-fallen paladin that serve darkness and evil beings. Of course Larian then should improvise and make its own changes that might get with some contrasts with the tradition (5e Player's Handbook), but a great RPG must be great and not be limited by some rules! Furthermore one could ask that if Larian created the Blackguard class, then what powers Oathbreakers should have? Should they just be (ex)paladins without divine powers (something like warriors?). Well that is a problem...
As for the 2000GP, I insist that is a childish mechanic. Imagine an competely different plot where a Paladin betrays his oath for power and greed. And by his actions on the one hand, he betrays his oath, but on the other hand he became a millionaire! Then he could instantly buy and sell his oath (and his divine powers) thousands of times, and this is very unrealistic! One solution you gave it; an ever increasing amount of gold each time you betray your oath, but another punishment might be experience points or even pernament power loss, like ability points or loss of max hit points. Also some more realistic solution is to just lose your divine powers and become something like a warrior (temporary) and when the plot advances and an opportunity is given, then with your actions you can please your oath, and only then you should pay the fine to the oathbreaker knight, only then you could regain your paladinhood!
