I've managed to never pay more than $175 for a card, or $150, or $125, ... or $25. I'm cheap. In fact the card shop owner in NJ who I really liked and got great deals from once said about me, "You're the guy who wants an $800 card for $10."
I do like tribute cards, but won't pay a premium for them, however I will overload a trade for cards I want, even tribute cards, but not often. I just did it for some Spanish cards of Nolan Ryan and Mike Piazza.
So to answer your question, not much.
Follow my blog - I Identify as a Card Collector.
“Aslan didn't tell Pole what would happen. He only told her what to do. That fellow will be the death of us once he's up, I shouldn't wonder. But that doesn't let us off following the signs.” - Puddleglum in The Silver Chair by C. S. Lewis