The thread was mainly for discussion and I still stand by my thinking that over saturation has caused somewhat of a decline. That is just the fact of simple economics. Too much of anything can cause a price drop for some.
I don't see how it caused a decline...
In 1979, there were roughly 220 million people in this country, it is currently estimated by the census as about 320 to 340 million people. But the percentage of WORKING DJs, doesn't seem to have changed much, in regards to the population statistics.
Since the recession started in 2008, people are willing to spend less, and DJs, like anybody else (except the food market), are willing to make less in order to make up for it in volume. There comes a point of diminishing returns when you charge above what the market can afford. Let's say you make $20,000 for 20 shows at $1,000 per -- the other dude that charges $500 per show, and gets 50 shows, earns $5,000 more than you do.
People are cutting back on luxury expenses across the board (with the exception of the uber rich billionaires). You have to roll with supply and demand, and not just keep raising prices when it's not warranted...