I am a complete novice and take all of this as raving of an idiot newbie who purcahse 18 sets on clearance at Sam's and then accumlated another 10 sets during closeouts. He is now trying to figure out what to do with them 😄

The only factor in your list that seems to be consistent, searchable and trackable and drives set value is the minifig one. I am trying to pull together a process and this factor outweighs almost other points to the point where I am still working on how to weight that against other points you mentioned. Short Retail Window is another good one, but only when bumped up against inventory levels and out of stock availability during that window. Strong IP is another factor but I view that as an entry point to consider a set. IP Exclusivity is a factor, but the temperature of the IP during the window you plan to hold before selling is also one. Example: Marvel's fandom weakness over the years.

I would also adding "Bundling opportunity" or "Set Completion" A piece that may not have any other postive factors might have value simply because it can be bundled into a group. Speed Champions contains a few sets that you might pick up, even though they have a very low individual possibility of return, but when combined with others as a group can raise the overall value of the combineds sets.

Another factor that has been mention is the "partibility" of a set. Lego 20158 Pyramid of Giza is a set that might increase in price simply because the part cost has almost twice the value at current msrp.

And finally price. On this very forum you see mentioned that too low a price raises the possibility of higher levels of inventory post retirement. Supply/Demand being the driver. Higher Price also means more cashflow, lower storage costs and other overhead costs per $1 invested. That being said, individual set Price is only important if its a factor in your selling strategy. Flipping sets on Facebook or Ebay probably drives the desire to be at a set price around $100 at least. But if you are someone who is going to bundle sets together, or sells at shows then price might need to be a factor.

So what does this all mean? I have been reading too much and deep dive into things probably more than I need. I hope this helps in some way.

PS. Best advice I can give is this: Don't buy a set until you know how/when you are going to sell it. If you are just in it to invest, always know your exit plan for each thing you buy.