NSFW: What goes on at adult video stores?

I’m talking about the stores that are purely video sales and viewing booths, not sex shops with other toys and goods. I’m so curious about them; it seems like they have a very specific culture. Can anyone provide insight?

Here are more specific questions:
– Do they always have video sales and viewing booths? Which contributes more to their business?
– What is the culture of the people who meet in the booths to engage in sexual activity with each other? (I found this thread, which provides some insight, but not much.)
– Is it all male/male sex in the booths, or do male/female or female/female pairs meet there for sex as well?
– How do the interactions in the store to arrange the sex play out?
– Does the store benefit from the people having sex in the booths at all, beyond the fee for the video viewing time?
– Do almost all of the people who use the viewing booths also have sex with others in the booths, or do some people only use the booths for individual viewing and masturbation?
– What are the demographics of the people who use these booths to watch porn and masturbate? Is it just old, scummy guys? Or are there also younger, non-scum people? And how about girls? Do girls ever go to the stores to just watch porn and masturbate?
– Can viewing porn and masturbating in the booths be an enjoyable experience for a non-scummy person, or is it just dirty and gross?

(I realize there was a question asked about adult video stores before, but it doesn’t really get into the specifics I’m asking.)