Why are you buying all of those books and all of those products? Do you realize that they're going to be cheaper in a year when the "craze" has died down a bit?
Reminds me of people who rushed out and stood in line to pay $500 for iPhones, and then they were mad when the price dropped to half afterwards. That's what you guy, I suppose.
The gaming market doesn't work that way. You might find a bargain on gaming items if for whatever reason their supply exceeds the demand (either due to poor sales or overproduction).
The fact of the matter is that too often in a niche markets (or for niche products), such as those in gaming where that have smaller production runs which may eventually dry up even when a small steady demand continues. This especially happens with high quality products that just didn't have good initial sales and so publication stopped, though word of mouth and reputation causes the demand to continue.
I've seen many gaming items that are sold for 200% to even 1000% of the original selling price due to supply shortages.
It all is still about supply and demand, and when you are dealing with smaller niche markets, the supplies tend to be on the low side compared to mass market items such as iphones and televisions.