I'm all for giving the client extra value. However, I do believe some Djs don't understand what the clients see as extra value.
Just because you paid $500 or $1000 or more for some equipment, the client may not know, understand, or care.
Is it going to make their event better?
Perfect example was when I started using my current equipment, I had many more people coming up and telling me how great the sound was. Some others reported the same thing.
There was a guy that came to the brand's website and said, "Hey, I bought the same equipment and I've had no compliments.". I asked him how many compliments he was getting before. He said none. I told him he has to at least consider the fact that people don't like your music selection, volume, or your sound. We were getting lots of compliments before... Like many others do... It simply went up.
A sound system can ENHANCE what you are doing, but it won't turn a bad dj into a good one.
Another friend of mine has been DJing for years. He's never once bought sound equipment new. He buys cheap used stuff. His presentation never looks better than average. But he's very busy because he's a great dj. People love him.
Point is... Equipment is great, but people see much more value in a great dj vs great equipment.