You guys are making a lot of sense, quit it now or folks will start talking.
For me, trading is always on the table as I am not a set collector (not sure what I am right now). I only need to want a card more than the card I have and a trade can happen. I think everyone should be open to trade with a mindset like that.
Lets say you have your main collection (nowadays known as
PC or
Personal
Collection)... and it's great. Someone offers you a trade for something in it AND you want the offered card more, why not? There could be an infinite number of possibilities why someone would want to trade from a PC. All that being said, I haven't done a lot of trading as, a few have said, it's just easier to buy or sell something. Oh well, just some thoughts from a type collector who has had a PC and is working on another...