Why many companies do not produce general masterbatch?

The vast majority of regular international masterbatch companies generally do not produce universal masterbatch. Universal masterbatch there are many disadvantages. In fact, the universal masterbatch "universal" range is very narrow, technical specifications, cost is also poor, in particular in:
       Poor coloring effect of predictability: colored masterbatch is used, universal masterbatch pigments in different plastics will show different colors, so poor coloring effect of predictability.
Other plastic products affect performance: in particular, the impact strength, the product easily deformed, distorted, more pronounced for engineering plastics.
High cost: universal masterbatch in order to "universal", often use a higher heat levels pigment, resulting in waste.