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My department head where I was an instructor while in grad school. (RPI)
No one in the department depended upon teaching salaries and all were investors/traders.
When I arrived on first job a person in my department at IBM was trading on the basis of TA in Magee. (1957)
We traded stocks on EOD info (hand made P, V charts) at about 10% every 6 to 8 days. We used the P, V relationship starting with 300 bucks and added 135 bucks every two weeks.
By early 90's about 10k people were reported to be using this approach. 4 out of 5 reject the premises when exposed to the approach according to polls by people who have rejected the method.