Hm, maybe I should've been more clearer.
There's a modern geisha and the ones before Showa era. Yes, modern geisha is determined as performer. But, it's like, so, the rules and guide lines of the Bell Tree Forums say that you're not allowed to sell/giveaway/trade any items that was made by hack/duping/etc. But? Actually? Same to it. The official determination doesn't always say the real situation.
And one more thing here is, this NHK - Japan Broadcasting Corporation - has been repeating to be prosecuted by, I don't know the very right words in English but, "made-up" these past years. In 2015, one documentary film that's called "Close Up Gendai ( Modern time )", last year, the show "Itte Q", etc. In both cases, they're accused by airing untrue story. If you looked into it, maybe you'd be able to find those journals? I don't know.
And lastly, or last off, I learned a lot about geisha from personal interest, as my grandma of my mother was geisha. To speak for her prestige, she was neither a girl who was sold nor be engaged in sexual job. Fortunately or unfortunately, she wasn't very talented, in that term. She worked as one of those lower class geisha, as back band.