Interesting as it is, Chewett, the total number of resources in the realm currently doesn't matter to most people, they don't keep track of it.
The ONLY time the cost of a resource such as, say, memory stones will go down (this is assuming that there will only be three gatherers in the long run, which is hopefully not true) is if people stop buying them. At this point, the ones selling them will actually go to people rather than people going to them, and they will sell for lower prices.
For example: Say I got a tool for collecting blades of grass. I could make, say, 20 brand new alts for item storage, then collect batches of 10, throw one batch of 10 on each alt and sell each batch for 3 silver, which means I can sit pretty for a while and not have to collect a thing. As long as there is demand for grass, nobody asks how much there is total, they just want to buy it from me, because I control the inflow.