Or even just adoption. Adoption is far cheaper as well.
There are plenty of reasons why people want their own biological children... but this seems like it carries a ton more risk with it. With complications from the transplant and heck even just childbirth.
Basically, it's not as simple as just handing off an embryo to another person and 9 months later acting like nothing happened. There are huge ramifications to a decision like this that don't come with being the birth mother.
https://en.wikipedia.org/wiki/Surrogacy_laws_by_country
Adoption on the other hand can be a risky path, leading to a different kind of problems, and some are very hard for parents. Everybody wants their sons being healthy and able to have a normal life but this is not always guaranteed with adoption. Some countries use shady practices and lie to the parents to obtain an emotional (not logical) choice. The cheaper the worst. Systematic racketeering is the minor of them. "Forgetting" about some important condition or omiting relevant medical information is much worse.