2
The “traffic” limit is not good at all in my opinion. I’d suggest a focus on bandwidth as that’s more in our control and more impactful on resources. Bot traffic can greatly inflate the traffic figure and force the package to be upgraded. The site in question is not a high traffic site, but bots crawl it frequently.
We’re an agency about to move 300+ sites to WPMU from our own servers. We’ve already had instances where we’ve had to bump up sites to higher packages (at our cost) due to tight limits. We’ve already had to look at moving a site away because it’s just not financially viable.