Selling individually will naturally get you higher returns per item. But, you also need to consider the plausibility of actually selling everything to make that effort to list and ship individually worthwhile. If you bundle something you can put desirable with non-desirable items and sell them as a lot, where-as, you may not have been able to sell the non-desirable items alone. To determine what is desirable or not and at what price point something goes from one category to another is not really predictable.
If you know your models and are fairly confident you can probably get the most for what you have. If you don't really know the models and market rates, you'll likely have unanswered auctions. I've spent a few grand on Rackham models and have watched auctions like a hawk when I'm looking for something. What I've noticed is that sometimes you'll have people bidding up a rare model to the nines, then the next time it lists it won't even go for a quarter of what it did before. I'm talking about NIB pieces too, so there would have been no packaging bias.
If you want to see what models have gone for in the past, Ebay has a great search option that allows you to review auctions that have ended in the last 60-90 days I think it is. It's quite handy if you want to see what has actually sold and what it went for.
Whatever way you choose is up to you. You can spend some time, do your homework and get the most out of your models selling rares as individuals with un-desirables in lots. Or if you just want quick money, shoot out some decent sized lots and they'll go. Rackham has a way of loosening peoples purse strings.
Naturally I'll say it here, if you want to sell some shoot me a PM. I'm a Rackham fan through and through and I'll give you a decent price if you have something I don't.
