Supply and Demand dictates that if Demand goes up, the equilibium price increases as well. However, there hasn't been enough demand for these products. Infact, TRD is discontinuing support for their TRD bodykits and suspension products.
I guess their putting the bulk of R&D costs on the remaining few who want to purchase these items. I know that since they're discontinuing, then Supply decreases and equilibrium price goes up as well, but they aren't decreasing in supply yet. Are they anticipating?