where to run spread daemons?

In mod_log_spread-1.0.4/sample_configurations.txt, it says:

We have a spread daemon on each host (it's feasible to run one only on the log
host, but it really doesn't work well that way at all.)

I'd like a bit more detail on what "it really doesn't work well that way at
all" means -- what bad things happen? TCP socket exhaustion?

I have a bunch of webservers that are identical and dataless that I currently
have logging to a remote spread daemon, ie:

  SpreadDaemon [email protected]

in httpd.conf -- there might be a bit of a performance hit if each apache
child has to open a TCP instead of a unix domain socket, but doesn't seem to
be a problem right now. What other horrible things can I expect to happen if
I don't run spread locally on each webserver?

Adi