I've been keeping track of RAW (i.e. ungraded) TA9 sales on the bay. All prices are in US$, auction-style & buy-it-now combined, per set and incl. shipping to the US. Boxes of e.g. 10 were counted as 10 individual sets being sold - it would be too cumbersome to divide sales by numbers of units sold.
This is by week (current week still lasts 4 more days) - average weekly sale price on top, qty. sold per week at the bottom:

And this is by month (bear in mind that Nov was only one week):

We're very close to 10k sets being sold now - 20% of the mintage has been traded on
ebay alone and within 4 months and 1 week of the set being released...
It's pretty obvious where prices are heading. The drops we had recently were because of the additional shipments by the US Mint of orders that were processing for ages. Some of those lucky ones obviously dumped these sets onto the market causing some temporary price damage.
It's also obvious that number of sales are dropping down. It will drop down to 500 per month soon by the looks of it, but that's still 1% of the mintage per month.
Who knows where prices will be in a year from now? I'm not sure how many are prepared to pay $70 or more for this set, but we may test that territory in a month or two...
And no, I don't expect a thank you for this (although you could check my current
ebay auctions).

Edited by omxfl
04/01/2015 7:37 pm