Is this prebuilt AI is a waste of money?

I don't have much expertise in building a strong setup. I want to run Qwen Coder and Stable Diffusion to help me and my team with product prototyping. I've checked around and found 2 options that closely match what I need:

1. AnonAI On-premise: 2 x RTX 4090, AMD Ryzen Threadripper PRO 5955 WX 2. Tinybox: 6 x 7900XTX, 32-core AMD EPYC

How can I save money on this?

For a single RTX 4090 setup from you, it costs $6k.

A brand new single RTX 4090 costs $2500. The Intel chip is around $230. Let's say the RAM is another $200. Where does the rest of the money go? Is that just $3k profit for you?