Reliability. Never had a digital file skip. Never had a digital file snap. Never had a digital file get so coated with condensation coming in from cold to heat or heat to cold that I had to wait for the file AND the player get up to temperature. Never left an important digital file on my desk. Never had a skuldugerous guest steal a greatest hits digital album.
There's is nothing about using CDs that makes any mobile DJ sense.
Of course, if one does not know digital top to bottom and has not mastered the art of vinyl, or tape, or CD to digital transformation, I join you wholeheartedly in the har-de-har-har. Stay with vinyl and end all the laughter.
Skullduggery can not be found in my internal word bank due to rare use in Public settings, TV, and Internet, and my word bank updates don't have the word pre installed. I ask that you replace that adjective with a more widely known word such as Tricky, or Double Crossing
Reasons to use CDs:
1. Sound Quality is top notch. You can achieve the same with digital MP3s, but hard to do
2. Some people still appreciate seeing a big CD Collection at an event
3. You can claim you have the Legally Purchased songs via CD (Some DJs may use Illegally obtained music) - However, This has no bearing with guests, clients, or any one else.
Reasons Not to use CDs:
1. Less weight, and less items you need to load in/out if you get rid of CDs and go digital
2. CDs skip from time to time...No matter how good of condition the CDs are in. They will skip
3. They become Scratched after so many years of using (Sometimes can scratch much quicker)
4. Some CDs can break in transport, or break by accident due to you bending your flat case to fast
5. Many guests/clients will go "WOW, this DJ is still using CDs..I haven't bought a CD in years" - I had that comment jast a few months ago at a gig
6. The Lasers on CD Drives become slower, or end up getting Burn out after years of use. If you are using an older mixer with cd players, odds are one of your decks could start going bad.
Overall, there seems to be more negatives than there are positives with CDs. I just recently encoded all of my CDs onto flash drives, and onto both of my laptops, so starting in 2016 I will be using laptops only. For the past 8 years I have been deejaying with a laptop, and my CD collection with about 30 - 50% of the music I play still being from CD. I'm not doing that any more. Digital only moving forward with a 2 laptop set up.
I may still burn a CD to use for wedding ceremonies, but that will likely be it.