You can be TOO efficient, at least when it comes to collectables.
I'm going through a collection of comics that sat in a garage for 25 years. Ironically, it's the comics that were in our mall store, which we sold, and which was then taken over by a former employee and friend. In other words, these comics had once been in my possession.
So far I've found a lot of bronze age comics that weren't worth anything 25 years ago, but are now closer to 50 years old and have gained some value. I've also found the first "Walking Dead" comic, which is worth over a grand (Theoretically. In reality, I doubt I'll ever manage to sell it.)
I've found a bunch of #1s that were just starting back then and are now long-running series.
I'd say 80% of the comics aren't really worth anything at all, but the other 20% at least have a chance of selling, given enough time and space. I'm going ahead and bagging and boarding these comics for backstock, even though only a fraction will fit.
Maybe 5% are worth anything in reality. So out of roughly 10,000 comics, 500 of them are worthy of attention.
This is what most collectors don't understand. Only a small percentage of any collection have the possibility of selling, and an even smaller percentage of those will actually sell.
So what do I mean by efficiency?
Well, I discovered years ago that I was very diligent about figuring out which comics are hot and needed to be given some space to sell. So let's say a comic series starts to catch fire. I grab the #1 issue and price it when it's five times its original price.
So far, so good.
But a significant percentage of these are going to keep increasing in value, and if I sold it for five time the value and it increases to fifty times the value, I've lost out. But someone who isn't as diligent will let it sit and suddenly discover it later.
Of course, an awful lot of of the comics I put out for five times the value actually decrease in value over time. That's why speculating is such a gamble. It so much a gamble that I realized that even a comic store owner who is up with the trends is unlikely to outsmart chance.
I stopped even upgrading the prices on comics about 20 years ago after the comics crash. Once in a while I'd grab a hot comic and increase the price after its selling period (We try to give everyone the chance to buy it at the original price.) I did this more to keep them around for people who were truly interested (after which I ascertained, I would cut the price) and out of the hands of speculators who just wanted to strip us bare and sell online.
Over the last two years I've bought two large collections, and I'm going through them box by box, and it's been kind of fun. I don't take it too seriously. I price most comics at a base price and don't try to look them all up: I'm sure I'm missing out on some key issues, but more power to anyone who finds them.
Anyway, I only bring up this "efficiency penalty" (if I may coin the term) because I've never heard it talked about elsewhere.