The late 60s, early 70s the business expanded with countries in Europe semi-legalizing by ignoring or legalising porn. The shops had a great source of supply, which allow them to dropped their troublesome production side. Why bother with horrible B/W pictures or films. When these were flooding in.
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The niche porn then was gay or anal or teens level niches. Why bother to go for a micro niche when people were buying mainstream as fast as we could offer it? That above all was the big difference to today. Plus the money thrown at producers.
No one cared if a movie costs $10,000 to produce. The images shot went into a magazine which paid the cost. The film was all profit for the producer, the shops doubled or trebled the wholesale price.
To picture the scene, imagine no free online porn and only 10 companies per country in the business. I don't know exactly but I would guess at the late 60s early 70s it was 10 companies supplying most of Europes porn production and selling wholesale.