I dont think they are bald under the wig.. I believe the reason why they wear wigs is because married Jewish women cant show their real hair to others except their husband..
4k for one bloody wig is crazy still..
And no I dont think its difficult being a hijaabi..
West they dont have to shave it off but most do, because its easier to wear a wig when hair is shaven or short, they usually shave it off on their wedding night.