How can you guarantee that you will stay hosting the node after we pay you? For all we know, you could run off with the money. Can we pay 50% before and put the other 50% in escrow?
It's my reputation to not do that, but you can do any amount in escrow if you'd like. Feel free to recommend a couple escrow members and I'll pick one that looks good. You can put 100% in escrow, as long as it's paid out at the end of the service month for the agreed upon amount (not minus escrow fees, if any).