All rules go out the window. Supply and demand reigns supreme in your argument. You’re the only one that has to decide how much you want it. Maybe even post a WTB with the price you’re willing to pay. If it’s good, you may motivate someone that has one, is not using it much and may be willing to sell it to you.
Because of course, as per the Funding Your Audiophile Hobby (Discussion and Q&A) you’ve explained how you’re a true hobby enthusiast and you’ll really enjoy having this last missing piece in your system.