I've been playing for about 4-5 months so far, haven't spent that much, granted a few hundred isn't that much to me, but, I think the game is nice so far. The events are sometimes garbage and sometimes really good with decent rewards. Some translations are really nasty but they tend to fix it within a bit. Now to answer your questions:

Not too sure.

Not too sure either, but that's why I don't go on new servers. My server merged recently and before the merge people were leaving or planning to but have stayed.

Read what I said up there.

Not a new server, probably the 500-700s, unless you plan on restarting 100% then yea new server.