Maybe she made a good extra cash by her payment content, maybe it is enough to effort a good life or maybe even enough to reduce the costs of her hobby and every hobby has it's costs.
So having a closet full of prosthetics may be cheaper than having a Harley.
And what I saw from one of her vids is, she has a VW T1 bus infront of her home and if this is her bus or the one of her friend, they might have a good income.
And those prosthetics are way cheaper and easier to maintain than going under the knife for permanent huge ones that never ever might reach such proportions she is showing.