Just to piggy back on some of the comments already received here.
I spent the better part of 3 weeks earlier this year adding my inventory (90,000+ cards). Since doing that in mid-March, I have made about 50 trades which has seen more than 5,000 cards move (more than 4K out of my house!). Prior to that (an 8 year span), because I was only adding limited cards here and there (mostly adding them for the transaction to occur), I had just over 5,000 cards move in that span. I have doubled the card movement of an 8-year span in less than 3 months because I devoted 3 weeks of effort.
Needless to say, it was WELL worth the time and effort.
At my old job, my boss used to tell a story (all the time) about the guy who was working furiously in the forest, cutting down trees, but he was only cutting down 3 or 4 trees a day - working 9-10 hours each day. Another guy would only work 8 hours each day, but would cut down 10-15 trees each day. Finally, the first guy asks the second how he does it - the second says "Each day, before I start, I spend 5 minutes sharpening my saw."
Spend the time to sharpen the saw (load those collections). It makes the experience well worth it.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).