Really? I get somewhere in the region of none to barely any, depending on the server.

I mean, yes, you'll get a constant stream of them on IPv4, but why would you run a server on v4 unless you absolutely needed to? The address space is so small you can scan every IP in 5 minutes per port, and if you have my v4 address you can enumerate every single server I'm running just by scanning 65k ports.

Meanwhile, on v6, even the latter of those takes a thousand years. How would people even find the server?