I would like to share my thought regarding adding one more utility for the REN token.
There are a lot of RenVM users are doing a big transactions on RenVM which means that they are able to help securing the network they are using by running a Darknode. In some cases it cost less than 1% of the user transaction value to run a darknode.
I propose to offer a discount on RenVM fees based on the number of operated DN by the user, The discount could be capped in pecentage or value to avoid commercial usage.
This will add more value for REN token, more DN registrations, and build a loyalty system for users.