Great in THEORY...
Reality is we do private events (mostly) and people aren't firing us, or walking out becasue we're less than some standard they chose.
I assume that ALL djs' have the same desired outcome - happy people dancing. We all aim for it but it doesn't always happen, for a number of reasons, often beyond our skills.
I'm doing a car cruise wednesday night- I was hired to play music and provide a microphone. I did nothing to bring in/promote the cruise, can't control the weather, timing of other events, etc.
If I do a great job vs average will it affect the next car cruise turnout? I imagine if I suck it will affect me, and perhaps the cruise.
I know I get rave reviews on school dances, but the decision makers change, and I've followed DJs and been told stories about folks not dancing, lower ticket sales as the last dance wasn't fun, etc.
I bring what I think is sufficient / appropriate for the event at hand...you may bring something completely different. For a school dance of 400 I brought TWICE the sound gear as another DJ...and I was asked to turn it up (i was pushing the limits when they finally quit asking). The other DJ was NOT loud enough IMO...one could have a conversation in the room in a normal tone of voice. Seems a tad tame for a prom of 400 kids IMO. But he keeps getting asked back...
So now you reach the issue of what does the customer know, can they compare to? I've never owned a ferrari, bmw, mercedes, lexus or a new caddy or lincoln. Are they worth their asking price? I will probably never know.
I know folks that are brand loyal - toyota or nothing, nissan or nothing, chevy/gm or nothing. Are they shorting themselves by not trying something else?
the competition can do everything right and still not get these folks as customers.
What is required DEPENDS ABSOLUTELY ON what is the desired outcome, quality, performance.
The service provider ultimately decides but the audience is the ultimate arbiter.