Even support for >1 per /24 is questionable when facing sybil, and it lets people be lazy piling on known hosters instead of shopping around for new tor / crypto friendly providers and supporting that by throwing money at them.
If you want to 'get your money worth' then also run I2P, Freenet, CJDNS, Pond, Gnunet, Mixminion, etc etc nodes on your contract.
Tor isn't everything.