Love how they want ~5,000$ for the highest RAM they offer, and according to Google searching that's ~2,000$ more than it should be (think that was the worst I saw). What fool (doubt it takes more than 1) is keeping them in business! 
Newegg has that RAM at $500 for 2 8GB sticks. 2 x 8 = 16. 8 x $500 = $4000. They really aren't marking up *that* much (still more expensive than doing it yourself, but you have to pay for labor somehow).
Remember: This is a Server motherboard, with server processors and server RAM. The RAM is ECC and Registered, that makes the ram very expensive.