a lot of reasons! some people do it to cope with certain things like compulsory heterosexuality or trauma, others do it because it's fun! im a little bit in both camps myself :)
selfshipping is something that has brought me a lot of comfort over the years, and has allowed me to explore aspects of myself that wouldnt be feasible to in real life! its contributed a lot to my mental health and my self-image! obv its super important to me, hence this shrines existence!!