ok, first off, who ever it was that said "I want to play on a server thats as close to kro as possible" theres a dilemma there lol. It is only a theory, but (and im only saying this as imho) you probably want to play that kind of server because you can afford to play the offical one? lol or cant read Korean maybe, but what ever, why would you want to play some slop excuse for RO on Gravities server? sure they made it, but they are dwarfed by some of the p servers out there.
now, as for what i look in a server that i want to play.
-little or no lag
-large community if possible (ill accept a small or non existent one if the server is uber awesome lol)
-customizations out the asscrack (if i wanted to play kro i would go to the official servers)
yeah, private servers should not be used as free version of the offical server, customs were ment for p. servers, hence why they are called customs

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-friendly gms that are funny and can take a joke, i dont mind if they are a little corrupted because that makes it more fun when you see two gms start fighting xD
-class balancing isnt really that important to me, i figure you play the class you like the most, who cares if its good for pvp or not.
-ah, to pvping now, i dont mind it, it brings more fun to ro and keeps it from being stale.
-payer items: i hate these, if you have to pay to get an item,s you automatically next in line for my Ro $h!tlist (jynxro was a server that was just so).
-donater items: these i dont mind because they are usually hard to get cards and items, and not custom items like the payers items always are.
-Woe: i also look for some good woe on servers that im looking into playing. again, if theres a uber small community then i basically pass by this one.
and really thats all i look for in a server. Which very few meet all of! (except for maybe GeoRo).
I have been on plenty of high rate servers with no customs etc with people that have been playing on them for years and im like, htf do you keep your sanity? because servers like Van Ro and Qro never update with customs and they got real stale after a few months and then it was boring, and i hadn't even maxed out yet!
So the thing that makes me most likely not to join a server is:
1. payer items
2. no customs what so ever just straight gravity's ro with higher rates (just recently started with this one).
And i do firmly believe that if we got rid of some of the gravity version lovers servers outa here that the very small to moderately sized private servers would gain a lot of people to the communities, because right now everyone seems brainwashed in to liking the official gravity, but not playing on the official servers but instead expecting EVERYONE not to use customs and to use the boring version of Ro from gravity xD
OH and to those of you who said you wanted nice people in the community and not "Arsehatters"... how do you plan on making them be nice? slap em on the wrist? go tell their mommies? really, think logically here people. not everyone is going to be nice and play fairly, weather its because they had a bad childhood (LOL) or because they aren't good at online games (look at Gunz as an example for that! noob hackers everywhere) theres always going to be someone that s*** it up. and the only way to deal with them is one of three ways:
1. ignore them and report them if needed
2. give them what they want
3. kill them when their back is turned xD
you cant except the runners of the server to press a 'nice' button that will make everyone nice and friendly, its just not possible. now if the player is being rude and calling everyone a slut or something like that, then yeah, i would think a ban is in order. but stuff like zeny plix or cards plix, i just ignore them like the homeless people on the side of the street that are begging for money.