Funny I used to build vintage sets for profit all the time. The key was do as much of your buying as possible in large lots, compile what you need and sell off the duplicates. When it gets down to card by card hopefully you did well enough in the bulk buys to stay ahead. I had no problem buying 200 cards to get 3 I needed because I could likely get those three cards for free by reselling the lot. Often I'd break the lot up some and actually make a profit.
My best was a 1971 set that cost me $11 net to build. Sold it for $600.
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