In the early 80's I used to use a TEAC A-3340s (4 track Reel to Reel) and make continuous play reels at home from all of my tapes and records. I would carefully make the segues perfect and made sure toe songs fit perfect. This is fun and superior results cause I could do it at home and take my time making the perfect 10" reel mix. I forget how long they would last at the slowest speed, but I would use that and no one said anything. When they requested a song I would simply say if I have it I will play it. If it was on the tape, I would play it. For weddings I would still use a cassette deck with all my songs recorded to one tape. (no one ever told me it was a legal issue!!)
I remember going to Kmart and buying a brick of Memorex or TDK tapes. I would carefully select the right tape for my decks!
I sure wish I had pictures of some of those setups, They would make most oof you laugh.
I even had an old, tall metal equipment rack I bought from Scott of Solid Sound in the early 90's for my studio and racked up some DJ equipment and a PC (for database only) It was aweful but the talent and music were always on time!
Now anyone can get a great setup and bypass all the various setups and trial and error we went through. They can look good right out of the crib, a few thousand dollars will get you a presentable system.
If I showed up with CD's I am sure someone will come up to me and tell me something about "still using CD's" but NO ONE HAS EVER told me about using a laptop. In fact they have been more impressed than all of the other years of my DJ career. I have had someone tell me that this looked easy and it pretty much can run itself, and that "If that's all there was to it...") SO, I asked him to run the next set, I gave him instructions, told him where to click, told him what to say, etc. Gave him his 5 minutes... and he CHOKED!
I gave him another chance, I would do the music, qeueing, segueing, etc. and all he had to do was make the announcement that I pened for him (nothing major) He choked, aske me to play some Ice Baby, and went and got lost in the crowd.
I bet most "DJ's" have other things going on like voice over work, jingle/radio/ commercial production, Sound Reinforcement, I have MANY things going on that are not part of DJ'ing but related as far as talent, and music. DJing is STILL the top money maker, even when some of the other things I do are bigger ticket items. DJ ing is steady!
I worry not. Even if I am only getting 2 % of the customers and the other 98 % think they can do it themselves, I ams still as busy as a 1 man show can be ads still have a life outside of the gigs!