I would offer $7000 for all 3 rigs, and that is still overpriced! Where on earth are you getting your sales price from?
There are 4 rigs. With 3 GPU's each. Total of 12 GPUs. And four 120GB ssd, and 4 Headless HDMI etc.
The sale price is the same price as the original on Ebay, but mine also come with all the extras