Frankly it is a way for the cosmetic industry to make money. I can tell you tat you don't need this. If you want you can make a tinted moisturizer yourself by mixing a very small amount of Foundation with the moisturizer!
Also-- remember that you need to stick to things that have been proven to work for many years , leave Primers and BB creams alone as they are new.
This is my best advice to you as a make up artist.