These dwarfs are professional artists. I think they do not mind They have to make a living.
It is however discriminating to make a difference between them and normal sized people. It wouldn not be in their favor to make this something immoral.
I am happy that people are aware of these parasites. Some online-ticket-sellers ask almost 4 times the face-value.
worldticketshop.com and onlineticketshop.com are 2 of them.