I've personally found that it is hard to consistently get deals on the buy side that would allow me to flip quickly and make a profit after factoring in transaction costs and fees. Maybe it is because I'm not a professional dealer and don't cultivate supply as my day job.
I find there's a lot of transparency in the market for the more popular, accessible cards (the cards where you'd be more likely to find an easy buyer on the other side of the trade). I've noticed that for higher end cards (over $5,000), there is a bit more variability in the pricing in auctions, but buying and flipping at those levels requires more working capital...
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