Yup, $9/node invest per node assuming dirt cheap Linux instances. Need 2 rewards to break even then 1 reward every month to not use your own capital. Either way, you have to pay for VPS rental out of pocket unless they accept NKN mainnet since transferring ERC20 has limited windows and fees likely as high as any rewards you gain in ~2 months. Not to be negative, but there is no way this makes any real money for an individual … a luck-based reward program is pure gambling. After my Vultr credits are burnt, I’ll kill the nodes and maybe offer the node wallets (Generated ID) for sale to others that want to play.
I setup 2 more Vultr servers (Windows) today (Toronto and Mexico City) since I won’t burn through the $100 credit in 14 days without more nodes. I already had extra NKN in my wallet due to ERC20 minimum transfer. Now I have 5 nodes and 25 NKN left of my initial $45 investment.
3 nodes in North America (Florida, Georgia, and Texas) running 224-243K/hour
Toronto is running 670K/hour
Mexico City is running 460K/hour
I might get one more Vultr node in Europe or Asia just to see what kind of relay rates it achieves.