I don't know the cz market as you do. Of course a "new" artist will not fill a place to the same degree, but you almost surely get a better costomer-per-fee ratio. (for example if DJ X costs 10000 euro and brings you 5000 people and DJ Y costs 2000 Euro and brings you 2000 people)

Depending on the location, you can make a load of money with 1000 People. And if the Party is good, there will be more people next time, plus you got the chance to have brought this DJ first and get a good deal with his agency.

At least that's how I see it working in many countrys.