What incentive would a user have to pay for using this instead of Tor?
SPEED! one of the biggest issue I have with TOR is that it's so damn slow. Now if nodes have an incentive to get paid, then they will provide good reliable speedy service to users. I think it would be best if we allow users to choose which nodes to use (and pay for), all anonymously of course, and also a reputation system for reliable/speedy nodes.
Also we should allow node operator to choose to service the users for free, so that those without money are not locked out of the ecosystem. These free nodes will probably be slower/less reliable nodes, since they are crowded.
In addition, there needs to be an incentive for "hosting nodes" (nodes that provide web hosting). Because centralized TOR hosting is often targeted, half of TOR sites are gone due to FBI crack down on Freedom hosting company. It's kinda like the "storj" concept, where you get paid for your disk space, and you don't see what's on your disk, so you can deny knowledge if you come under scrutiny.