As blockend mentioned it is a niche market and most of the buyers will be other street photographers who appreciate the style, chances of any subjects ever even coming across a picture of themselves is very unlikely and then they may not even be bothered. Costs a lot of money to sew someone, so you want to be sure its worth it.
I was taking a photo once and a guy walked into my shot and put up his hand and shouted don't shoot! Shot anyway as you would and he come up to me threatening to call the police if I didnt delete the photo, tried to explain that it was a film camera and I couldn't delete an individual picture, didn't understand, kept on arguing, so I looked at the back of my 1957 range finder, pretended to push some buttons, said its gone and he walked away.....all part of the excitement.
Happy to do street photography as an amateur, have a job don't need another, but am always surprised at how many seem to want to sell pictures or are waitingto be discovered. Think they should probably work on their marketing and worry less about getting sewed.
Just as niche as any photography.
My ex-client sell it via interior designer. YouTuber sells it on his tens of thousands subscribers channel.
More than many who called themselves as artist.
Personally, I do it for my own interest. It just lives inside me.
Mentally challenged people are acting as you described. Do what those less fortunate are asking. Or it could be those who are in this particular place and particular time then they supposed to be somewhere else. Cheating, sneaking out from work and such.
Or they could be refuges, witness relocation and so on. KGB and else. No problem really.
I wish I have started it early. Before USSR dispersed and before Russia became Eastasia of 1984. And before Europe became EUSSR. Even without politics involved it is so fascinating to look at street photos from 20, 30 and so on years ago. Even empty streets...
Better than mostly giftless dross which is for sale by so called artists. IMO.
If you do something you like and share, not for just profit, people will know you. I know it by myself. It takes years and decades.