Question: Midichlorian's are chemical compounds found within every living cell that forms the basis between the connection life and the Force. Without midichlorians, life would be impossible. The amount of midichlorians in a life form represents its ability to understand, comprehend, and manipulate the Force.

My name is Darth Incognitus, and I have decided to absorb more of these cells into my own body to make my force sensitive abilities stronger. To accomplish this, I have kidnapped numerous force sensitive users who match my blood type. When their midichlorian count has been measured, I will perform a blood transfusion from them to myself in order to absorb these cells. After I have attained enough of these cells, I will become the most powerful force user in the world and create my Sith empire. Then, I will use this method to strengthen my apprentices and students.

However, after a number of tries, I have noticed that my powers have not increased. No matter how many Jedi I murder and drain of blood, my abilities remain average. Why would this be the case?

Answer: 
**Putting more fuel in your tank is not going to make your car drive any faster.**

Midichlorians are a resource, but it's unclear how this resource is being activated. If, for example, the brain uses midichlorians in order to send out a psionic signal which connects to the Force; then there's a natural cap at your brainpower.

For example, let's say your villain's body actually generates less midichlorians than their brain can use. At this point, adding more midichlorians to their blood will in fact increase their brain's psionic output as it is no longer running at suboptimal efficiency due to lack of midichlorians. 

***Analogy**: Your car will run better on a tank of gas than it will on fumes.*

However, if the villain already generates enough midichlorians to saturate their brainpower at full capacity; then adding more midichlorians to their blood is not going to help, the bottleneck is their brain capacity. 

***Analogy**: Putting even more fuel in your tank is not going to make your car drive any faster.*

This creates the option for you to have the villain *initially* see some improvement, but then very quickly plateau.

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*Note*

I suggested that midichlorians are consumed by the brain and regenerated by the body; but the same would work if midichlorians were considered a catalyst which does not get consumed (nor regenerated). The brain can only use so many midichlorians at one time.
Midichlorian's are not the bottleneck in this equation. Your body and brain have developed "Force pathways" to make use of the amount of Midichlorian's you naturally have in your blood. They finished developing at the age of 16. You can add all the chemicals you want to your blood now, but your body and brain simply can't use them for anything--they can't handle that much Force.

Now if you'd started these transfusions before you turned 16 and your body finished developing it's Force pathways though... Have you thought about creating a test experiment heir to your power?