I use 'end of night jingle trails' ... so to speak, but not at every function.
Depending on my clients / the nature of the gig, will determine if I play an 'outro' or 'theme', but I tend to use an end of night 'jingle song' for regular / residency work, such as:
Hit the Road Jack - either Ray Charles or The Weather Girls
Bring Me Sunshine - Morcombe & Wise
Ti Adora - Pavarotti
or 'my' main theme from The Professionals (i've used since 1992)
At the end of most adult gigs, be it an Old Skool night or Wedding or Birthday Party, the right moment 'jingle theme' can cause some funny and silly antics (especially with Bring Me Sunshine or The Professionals theme)
For years, I used to play the Hawai 5-0 theme (again at the right moment), where guests would 'surf' and 'air-row' but far too many other DJ's were doing the same thing! I always strive to be different.
Because I produce 'jingle tools' and mixed 'music-beds' for personal / third party use, they can be ideal for 'intros' - they are short (from 20-30 seconds each) but perfect for quiz nights or 'intro-mixing' for certain music genre's.
I believe that DJ microphone use is a better form of 'human contact' with an audience (when requested to announce such things as 'last orders') because 'jingles' don't carry any interactive or expected command responce like a DJ has on a mic.
I've found many DJs try to use jingles for a more 'pro-presentation' but this isn't always the case in practice!!!
The 'jingle' is either too loud, to quiet, to quick, or just not
effective for the moment.
One could say it's down to what the DJ is happy to use and feels confident in useage. But from my personal experience - what I have seen, the Mobile DJ who plays a Jingle at a gig will be usually more 'excited' to use a jingle than the audience (who either act bewildered or very uninterested in the DJs 'gimmick').
So for disco advertising - stick with the tried and tested. Business Cards, poster flyers, Letterheads, etc.
By all means - if a DJ is happy using 'production Jingles' - fair enuff.
But just how the jingles are used and presented is really something else.