Players don't quit, they just jumping to new server with hope they will become a winner.
Define "Winner" : People who stay at the top 20 no matter f2p or p2w, as long as they can get all rewards from daily events.
Since everything in this game was designed to be 80% pvp related and most of the resource are behind ranking wall. So if somehow you failed to become a winner, chance are you will stay at the bottom forever unless people at the top get bore and quit or you need to pay.
Don't say thing like you will eventually catching up, things like that is impossible if your top players keep doing their best, there are reasons for them to be at the top no matter f2p or p2w.

So unless they change how the game work (which they won't ever do that) new server will keep coming out. Each time a player ate enough dirt of defeat and jump into new server there is also a small chance that player will use his experience from old server and PAY to become a winner at new server. And that mean profit for Oasgames so yea, they won't stop doing what they're doing.