There certainly are men in Tokyo that have had Sugar Mommas. Hosts, Djs, singers, musicians, dancers, actors, fashion designers & models that I know have had sugar Mommas. Usually the woman had a love for what the guy did & wanted to help or the guy was really cool & good looking.
The women are of variety of different backgrounds & usually have a connection to them. Some come from good families, some have high end jobs, some just saved all their money having nothing to spend it on, some work in hostess clubs etc.
I look at the question as what does one bring to the table to attract a sugar momma instead of do they exist.