If people take more than one class are they able to advance their skills each time by learning new/ different skills?

Yes!  The more you are on the torch, and the more you learn, the better you will be.  We feel after taking your first LAE class it is best to rent some time on the Nation Torch for only $25 to learn the feel and flow of glass a little more.  Once you have about 15-20 hours another class will be much more beneficial than if you take a class right after your first class.