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FYSJust taking the first card in the T206 and comparing realized prices and availability (Data credit: Vintage Card Prices.Com)
1. Abbaticchio (Blue Sleeves)
SGC 50/4: 1/26/06 eBay $105.50
PSA 4: 12/17/06 eBay $76.99, 12/15/06 eBay $79.88, 8/1/06 eBay $86.00, 6/6/06 eBay $86.00, 5/21/06 eBay $135.50, 11/9/05 eBay $56.00
The SGC sale (1) exceeded 5 of the (6) PSA examples and far exceeded the most recent PSA sale.
SGC 40/3: 12/3/06 eBay $49.00, 11/12/06 eBay $36.98, 2/20/06 eBay $36.69
PSA 3: 11/3/06 eBay $59.88, 6/21/06 eBay $36.78, 6/11/06 eBay $49.98, 3/13/06 eBay $36.52, 1/3/06 eBay $40.00, 12/21/05 eBay $37.00, 12/9/05 eBay $39.05
SGC average price (3) = $40.89
PSA average price (7) = $42.74
SGC 30/2 (3): 10/14/06 eBay $32.29, 8/20/06 eBay $22.16, 6/27/06 eBay $17.50
PSA 2 (1): 12/4/05 eBay $30.99
The last SGC sale outperformed the latest PSA sale.
SGC Total Examples Sold: 7
PSA Total Examples Sold: 14
This is only one example, so the data means little, but I think the statement that more PSA cards are on the market than SGC cards is undeniably true. However, that means very little as 21 examples of the card came up in the last year on eBay alone.
The statement that SGC does not sell for as much as PSA is not true. You will certainly find individual examples of disparity. As a whole, across all grades and all sets, there is no difference!