What are the consequences of not rinsing hermetic lentils prior to use?
The only consequence is that you will eat the liquid in which they were. They will taste different with it. Also, if you cook them, they may be more prone to sticking, because of starch and other stuff sticking to the surface. This is not an issue in salads, though. 

You probably already know the consequences anyway, since you have been eating them that way already.