The deal:
$100,000 for Yeahlight and his buddy to bring the EQ Classic project to "patch-free" completion, using their own resources, within a one-year time frame.
SOE hosts the launch server and pays an intern to provide customer service. Let's assume $20/hr, 8hrs/day, 5days/wk for the intern. That's $800/wk customer service cost. Let's call it $1,000/wk for customer service plus server upkeep.
Yeahlight splits all profits 50/50 for the first two years after launch and provides unforeseen patches quarterly, 10/90 after the first two years for the life of the server.
Assuming 1000 players paying $15/mo for a classic EQ experience. That's $15,000/mo or $180,000/yr revenue. Profit = revenue - CS + maintenance costs = $128000/yr
SOE makes more than their money back in 2 years, profits $115,000/yr after that, and becomes the savior of the classic MMORPG community. Yeahlight makes $100,000 (minus whatever he pays his friend to help with the project), then $64,000/yr for the first 2 years of a live server, $12,800/yr thereafter, and sees his dream realized.
I'm sure there are more expenses involved, but I think there is a business case here for a profitable product.