Again, issue isn't masterworking. Infusion is what's demanding all the cores because between the two features, infusion is the one with the most immediate benefits. Unless you're lucky enough to have hundreds of cores, you're not masterworking, and chances are you aren't anyway and just hoarding cores for the next power increase. Cutting masterworking's core cost is nice, but it doesn't fix the situation because masterworking isn't the feature breaking the economy on cores. If the solution doesn't involve infusion's cost somehow, it's not going to solve anything.