I only trade duplicates...and the vast majority I trade 1 for 1, however I do ask for a little more for some cards. Autographs and jerseys I ask for more than one card, and also vintage... although most vintage doesn't meet my personal quality standard to be listed on my tradelist. Not that I encounter a lot of older stuff enough to even have duplicates, but it does happen from time to time.
I would trade each of those for another kind of the same 1 for 1.
If the trade offer is for something that's part of my collection, it's not going to happen under any circumstances. I have every card I've ever had over 33 years now, and that's not going to change...ever.
VERY slow trading due to health problems. Not transferrable so safe to trade with, just moving is painful and can't always access the cards.
Cardboard History My COMC
New Collection Website: Cardboard History Gallery (Still under construction)
Tips on how to make your scans look like the card does in hand (No more washed out, fuzzy scans!):