I don't think it matters for most cards. At this point, they have fairly well understood values outside of things like pandemics making everyone crazy.
For most a simple search of ebay completed items provides a good approximate price.
But for less commonly traded things, it's good having a price somewhere, anywhere.
I don't particularly care what someone paid, and consider it a pretty tacky negotiating tactic. If I do know, I keep it to myself and might use it as a guide if it was recent. Like if I know someone paid 50, the chances of getting close to that are low so I probably wouldn't even try. (being an opportunistic collector, I generally don't negotiate, either the deal is good, or I just pass it up- just like at shows)
WFIW, a lot of my cards were bought in the 80's... bringing up what I may have paid would be incredibly irrelevant.
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