I am the person who played in Prime and switched to Medea. I want to share my views about the death of the server. The reason for the death server is not because of black market, its on the server itself.
First, when tops max gears, they don't have a place or events to play. Since all rewards from bosses are trashes actually. For example, earrings from Asteroth? they are useless since the options have absolutely no impacts. Purple box giving 380 items with hp mana options + non luck? Its better to find a place such as Kubera to farm zen and get tier 7 with better options. The boss system itself is designed very poorly and unorganized. Can someone answer the questions: "What should we do when we max? What's next?". Well, many good players tried to answer the question and the answer is in the ranking table: They are offline.
Second, many stuffs in ss15 does not work and does not make any sense in this server. For example: elemental damage does not work in the server and the difference between 3rd and 4th wings in % dmg increase & absorb is very slightly. That makes 4th wing becomes priceless, it's not worth to invest in crafting 4th wing in this server because the cost is expensive and it does not make big differences. In addition to that, we don't have special accessories such as pendants and rings which is a minus.
Third, GMs mostly ignore all suggestions from players and they do not actually take care of them. I understand that they have real stuffs such as jobs, family in their own life. We do appreciate them for hosting a server for us to play and the only thing we can do is supporting them through donation and giving suggestions. They replied our some of messages within a week and some are ignored completely. Oh well, that is how server supporters are treated in here. GMs do not take any responsibility for their works. I personally feel like they host the server and put it there to make money instead of making a place for MU lovers. One of the highest consumption tax in the world is 13% only, but in here we have to pay 16 (15 for the sv creators and 1 for CS owner). Sending bonuses as gift to a friend, we have to pay 15% tax based on the gift's price.
Finally, before Medeax100 opened, they'd already opened Prime x5000 and they did not realize many serious in bugs in their own servers such as seals + vip bug. Many people quit after the bug was fixed because the gap between newbies and tops are huge. In other words, they did not have a good solution to solve the problem. Blaming for not reporting from players is not a good reason since they do not actually care and observer their community. If they did the problem would be fixed in months ago but in Prime.
I do not care whether they open a new server or not. Because if they continuous working like this, they will need re-open their pools every couple month and waiting for others dump fishes swimming in.