I've been "averaging" Neptune's population in the past week as best I could - logging in at intervals and getting the population count. It averages to be .5% (yes, there is a decimal place in there)...
KK, you employ GMs on that server. You pay for the hosting, the bandwidth, the maintenance, the hardware... Why are you throwing your money away? Mercury at least spikes at 10% or so during peak times - I can see a reason to keep that one around for now...
Can't we just admit Neptune is a failed endeavor, save what you can, and move on? Not sure how the servers are setup, but if they're clustered, redirect some Neptune resources to the other servers maybe? Or open up a few new zones on the remaining three servers? I'm just sure there can be SOME sort of actual usage for the Neptune Server's hardware & resources