This is irrelevant for ShadowCores, especially considering that the levels you lose aren't easily regained, so the people who are above level 350 will have a harder time regaining their levels if you kill them outside of a guild war. This is why it's unlikely to see the top level players in battle, they are afraid of losing their levels and they are more likely to participate in battles using alt. characters. Cash should not be a problem in such aspects, there is no difference in the power of supplies you can buy whether you have 10kk or 100kk in your bank. The only problem with inflation is that rare items and houses become more expensive, it doesn't have a significant meaning for gameplay. I think this is just a bad excuse that people use when their actual problem with ShadowCores is something else.
I have time, but I can't speak for anyone else in my team since they barely dedicate time to log in on their gamemasters, so it's unlikely that a third server will happen anytime soon, if at all.
If we were to close down LunarForce (which there are no current plans to do), yes, everyone on LunarForce would get a free transfer to ShadowCores and the new server (if it does happen, not saying it will) would more or less be similar to ShadowCores because that has proven to be most successful.
That's because the people who argued for lower levels stopped playing for whatever reason, the low rates along with the low party experience bonus makes it challenging for them to level up faster than you can kill them if you actually choose to play. This is a reason why we're against reversing our decision on the party experience change, LunarForce isn't a server for people to level up, but a server for people to have fun battles on (no "noob chars" ruining your wars, 50% damage AOE runes and spells, etc.). 350-400 is more or less the peak where people will be around on LunarForce, because it's 2x experience rate after 200 and 1x after 400.