[Mandalore93]

Five minutes in and he's already committing a huge, HUGE fallacy. He's equating modern finance with the medieval equivalent. Especially in A Game of Thrones the actual crown land of the Iron Throne seems to be pretty small (I.E. the lands ruled directly by the crown) and as such would have remarkably small revenue when you think of the entire size of the kingdom. Assuming that there was any significant taxes on the other kingdoms it still probably wouldn't be that significant since the throne relies on their constant consent to rule. It was actually very normal in English history for the throne to want to go to war and have to raise taxes/debt spending but end up using the army they raised via taxes to put down tax rebellions. The English crown was literally ALWAYS in debt pretty much from William's time onwards unless they repudiated their debts (which they did multiple times). So regardless of Littlefinger's competence/incompetence/planning it's actually super realistic for them to be in shit tons of debt.