Call my comments whatever you like.
The point is KINS, Skokie Valley, along with a few other halls do exist with enough space to meet whatever you require. Hire one of the local caterers in the Acheinu and wallah! You have a beautiful wedding for a fraction of the cost you were quoted.
If you want to keep up with the Jones’, do wahtever floats your boat. If you choose to spend 20K because you THINK people will be impressed, sweet secret: THEY’RE NOT.
The Concord started as a chessed project and till this day is a non-unionized environment. This itself saves a lot of money of waste. However, don’t go into despair there are other alternatives that don’t have the union rip-off fees.