I dunno, maybe they don't advertise enough. This server started about two years ago, and is the best server I have seen. Ever. Yet very few people know about it = very few people play it. I guess the server had some trouble in the past, but now it's pretty much a perfect server, and no one knows about it. What do you think? Would you play this server? Here are some of this server's features:
Rates: 6x/6x/8x
SVN Version: 12177 SQL (STABLE) - Has stuff like Nameless Island, Thors, Rachel Sanctuary, Homunculus, etc...
Some little random things: Never has had a wipe, no donations, no lag
WoE: 2 WoEs a week (1 Wed, 1 Sat)
No Job Changer
Free Healer and Warper to any level of any dungeon
Stylist with custom palettes and the 4 (2 male, 2 female) newest Gravity-made hairstyles
Custom quests for 100+ headgears that are otherwise impossible to obtain (stuff like Alice Doll, Neko Mimi)
Custom role-playing quests
A mall in Prontera that offers everyday necessities (arrows, pots, pet food for all pets, etc)
Commands: @who, @time, @refresh, @autoloot, @mi, @ii, @whodrops, @showexp, @showzeny, @autotrade, @invite, @duel, @leave, @accept, @reject, @main, @commands, @noask, @hominfo, @homstats
I guess my opinion could be biased because I have been playing for the whole two years that this server has been online, but by looking at other servers' features, PcRO's pretty damn good. It's not over-customized, yet does have some pretty cool stuff. The fact that donations are nonexistant is also a huge plus. If I know that a server has donations, I don't look at it any further because donations = corruption.
PcRO's website is also very, very pretty. And I think they are changing the website layout soon to make it even more pretty.
Edit: Oh yeah, PcRO stands for Player's Choice Ragnarok Online. Which it is.