To be honest this is a very strange policy to give some servers extra features than others and a lot cheaper too.
bottom line, Oasis should
1-Make it fair and square for all servers.
2-Reveal the chances in the events so you will spend knowing when you will get what you are spending for.
3-Decrease the rate of prices for God's sake, we need to sell a kidney to get a ninja that we want.
4- Give more events for the F2p not only to get 4 or 5 frags of 1 event.
other than this I wish someone to write the real money rate for getting a ninja so people could imagine what are these guys doing.
I will give an example. if you want uchiha Itachi susano'o u need at least 1200 scrolls. if you dont have scrolls and you are purchasing in a "discount event" you will get those by 12000 coupons which means arround 230 US $ which in some countries is more than a salary of an adult individual???
I played other games online without saying names since 2008 till now where if you spend 230 $ in it the whole server you will be very strong and happy and have lots and lots of merits which in the same time will help you but will never give you a great advantage on the F2p and as a developer company these other games really win a lot because they have so many servers and so many active players and putting money is a normal thing for all players.
Please adjust your game and I myself am willing to continue spending for this game but only if it is reasonable and giving chances for f2p more than that.