Ironicaly, however, you know me as a being a gamer for a long time on a lot of private servers. I can tell you from my observation of stuff. I've checked servers that basicaly had no PUS, last one being Quarantine KO. I liked it even tho i'm known baba shopper for mostly anywhere I played. My team were doing great there top 1 clan still, server died out really fast tho and started with decent population, died in less then week. However to get on point ... Players love to baba shop, for some reason (and there's more and more of those that can afford it) as soon as there are KC vouchers in PUS. There will be gold farmers or item farmers selling them for KC, and there will be baba shoppers buying stuff for KC vouchers. And somehow that type of gaming nowadays is the most active really. I mean it makes the most active server and market on the server. How? I don't know, never studied economics really... but it does.
Community is well awared there is no server that will last year or 2 or so on (or whoever is not awared of it is a, pardon my french, damn fool). But they still choose to play and spend money on it. Why ? because they have fun and obivously they must have money. Nothing wrong with that. In my eyes still more healthy to spend few hundreds of bucks on a game then alchohol or drugs, whatever works for someone when it comes to entertainment really.
But some of you making comments, servers relaunching, stealing money and so forth. Really doesn't make sense. If you're long enough on PSKO section on these forum so far, you should have realized every server dies out at one point or another. And by donating you are not "paying for service" you are donating which nobody is forcing you to do so.
Now you will ask, so why doesn't everyone try to open server, squeeze out some money and close it? First of all, you need to build up a reputation to get player base to even have some donations to be worth while. Second of all if you will open it for a week and close it and keep money and re open. Nobody will take you seriously, you might pull it off max 2 or 3 times considering how stupid the community is nowadays, but no way to pull it of more frequently than that.
By building up a strong player base like OSKO did manage, or what I was trying aswell and some other admins, One will simply not afford to try give sense to people that they are being scammed in anyway nor will one close the server when it's still being active. But when server dies out and people are requesting relaunch (not all obviously but enough for owners to decide to actually do it apparently) don't see why not do it.
In reality people are really jumping the servers only for the fresh start thrill of each and every one of them. Either that or trying to find the perfect Private server concept, which they never can and never will cause to many different tastes :P