I like the idea simply because it provides an excellent failsafe to prevent the prism market from crashing.

If a piece of gear becomes popular so does it's prism. Let's say LW3 for example. People craft tons of LW3 prisms to get in on the profit and you end up with a surplus. Instead of crashing the entire LW market, you've only crashed the LW3 market. By the time the next market crashed LW3 will start to recover slowly.