You should tell them that steroids put a lot of pressure on the heart, kidneys and liver. Bad lipid levels are common with steroid users, AIs (anti-Es) or not. Blood pressure problems are a huge health hazard.
Listen, let them take their own path; if they want to go under the knife, get possible life long scarring and pay $6k - that's up to them. Oh btw, if the gland isn't removed during the gyno surgery (as it usually isn't), the gyno can come back. Some people have to go under the knife multiple times because they were stupid enough not to just use some letrozole or nolvadex.