Estimated roughly on $ value/spent.
1.) Ebay - 5%
2.) Auction house - 20% (includes general, non-sports specific AHs)
3.) Net54 BST - 5%
4.) Card Show - 50% (including the National)
5.) Other - 20%
"Other" is mostly trading, which I guess technically aren't purchases (though I probably bought the cards I was trading with at some point).
Ebay purchases have dropped off considerably in the past couple of years.
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