And keep in mind that nobody is forcing you to buy something if you think the price is too high, especially if it's something you want and not something you need.
I've watched many high-priced BIN items sit for months without selling. Apparently many Japanese dealers don't feel a lot of pressure to make a sale. Many seem happy to let listings just sit, and I always wonder how they're making a living. Some will occasionally drop a price, sometimes substantially, you just have to be patient and vigilant.
You also need to be very clear to distinguish want versus need. If it's something you absolutely must have for some assignment, then you pay the necessary price and move on. If it's something you want, maybe you can afford to wait. And you should never look back as the market changes all the time and both supply and prices go up and down (usually in opposite directions). An item was worth, to you, what you paid for it when you bought it, all things considered. If the market price changes later, well, that's life.