I was always one who thought it would be easier to sell one big lot and people would buy the whole thing to get that one or two figures that they really wanted. But after years of selling, I realized that usually was wrong. It works sometimes, but not always. People would ask for me to sell just the one or two items, and when I said no, they walked. People don't want to pay more for a bunch of stuff they don't want. I tried to sell a whole Indiana Jones props collection, and thought I could move it as a whole collection, only to find that most people already had some of the pieces and were not willing to buy it all just for a Grail diary or a Cross of Coronado; so I ended up splitting it up to move it.
I also tried to sell 13 guitars in one lot. I didn't want the hassle of selling them one by one, and meeting people over months via Craigslist to sell them for max value. So I lumped them in one lot and asked $3500. Now we are talking some Gretsch (Electromatics) guitars, a real Gibson Les Paul Studio, one Mexican Strat, an American Strat, two Mexican Teles, a 210 Taylor Acoustic, and much more. When you broke the value down, I was asking around $270 for each guitar. Seriously losing money as some of these were close to $1000 each.... but I just wanted them gone and had some immediate bills to pay, so I thought I could quickly move them.... BUT, no luck. I had people offer me $300 to separate out guitars they wanted, but they didn't want them all. I finally took them to a music store and they offered me $3000 for the lot, so I took it. It was a stupid move, but it was the cost to try and lump them all together and sell them. Had I asked $500 a piece and sold them one by one, I would have probably doubled my money.... but spend a few months dealing with it.