I played a wedding this past Saturday - and donated some time and equipment rental to Relay for Life.
At the Relay for Life their DJ canceled on them - the Friday before the event on Saturday. I went up with my small and medium PA systems in hopes that one (or both) of them would work for the event. I also threw together a basic 'rig' comprised of a mixer (M-Audio NRV-10) and 2 CD players (Tascam CD-DJ1's). Dropped in a wired microphone and took off for the event.
When I got there, the head count was fairly low (about 100 people or so) in a gym. I set up the Fender PD-250 and got it all setup. Played music for a couple hours, and then took off for the 2 hour drive to the wedding.
Since the wedding was 'smaller' than typical for me, I opted to keep the medium PA system in the trailer instead of dropping by the house and picking up the double Bose L1 rig. I set up, played the wedding, and then left - driving the 2 hours back to the Relay for Life event so I could play a couple hours more, and then tear down.
Oh, that 'medium' sized PA system? A pair of Behringer 212a's on sticks. Hmmm.... Do I think that wedding would have been any better with my Bose? No. It's not about the equipment no matter what anyone tries to tell you. As long as the PA system is properly sized for the event it doesn't matter (unless there is an equipment rider for the artist...).
The 'tools' we use are more often for our own 'gratification' or 'bragging rights' than for our clients. I don't ask the carpenter about his hammer, and I don't ask the painter about his brushes. My equipment doesn't matter to my clients. As long as I'm using 'professional' equipment that's clean and fits within the decor of the room (skirted, etc) it shouldn't make one bit of difference to them.
BTW, my clients didn't care that I was using Behringer speakers. The F&B manager said at the end of the night, "Now that's the kind of wedding reception I want!" Do you think my Bose would have made any difference in his comment? I don't...
But we come back time and time again to equipment... I've stopped buying gear and I'm actually selling a lot of it off. Why? Because I simply don't need everything I have any more. I have 3 PA systems, 4 rigs ready to roll, and could probably put together 2-3 more if I had to. But none of it matters one bit to my clients. I was using a Mackie Onyx 1620, offboard Peavey effects, Shure Beta58's, and had a lot of other processing at my disposal - and my karaoke clients didn't care. If I had to do it all over again I'd use an M-Audio NRV-10 - ditch the processing, and use Shure PG-58's. The singers don't care as long as the sound is 'decent'. They want a SHOW...
It's not about the gear...