Can you do a PoC and see if it will work? One of the things I learned in econ is you can't really understand what price a market will support without putting up a store and selling something.
Rektide's comment about data corruption is troubling, but perhaps they have fixed those. I wonder has RethinkDB been Jepsen tested recently? 2.2.3 was tested, seems ok, latest version is 2.4.x https://jepsen.io/analyses/rethinkdb-2-2-3-reconfiguration
