As a section it made basically no money, very few people were actually buying components, maybe one in 50 customers. Most people came to the store for batteries, chargers, step down converters, antennas etc, and I believe they were the real loss when dickies moved into the TV era.
However, despite the lack of traffic, it was the highest maintainence section of the store. It took three times the effort to maintain, because people would pull out 5 different strips of resistors and three different strips of caps, go back to their color chart and circuit diagram and figure out which two they actually needed, and then shove the six other strips into a random drawer and walk off, and it was the staff that had to go through 300 tiny drawers with a resistor chart figuring out what went where. You'll notice jaycar keeps most of that shit behind the counter.