@CraftyMyner Please elaborate.

Sorry this is about to be long you have been warned.
For instance I believe I saw somewhere mentioned earlier not giving out eggs that you would turn into spawners. presumably that meant eggs that there really would not be any reason to want to make a spawner (example: bat egg). Perhaps it could be determined what eggs were given out during the time that it was allowed to trade them in for spawners and after this point no new eggs from future months be allowed to be made spawners. The other thing is that it is a new spawn egg each month so if you do not have VIP + that month you do not get the egg without trading someone thus increasing their value. Also there are spawners naturally in the world that people can use for xp farming. Another option could be to out right limit what you will make spawners for such as maybe a spider spawner is ok but a zombie villiger is not ect.

While some of the older players already have established spawners I do not feel that it is entirely an unfair advantage. The longer anyone plays on this server the more of an advantage they have. Also there are individuals such as cephid that have, in a way, leveled the playing field in terms of a rarer more useful item. Also at the moment everyone has the opportunity to buy vip+ in order to obtain similar items or they could team up with other players who have established spawners. I guess when it comes to the whole spawner thing I am ok with somebody having more stuff than me or different stuff than me. I guess I feel like many people have an advantage in one way or another and I would rather spend my time enjoying the game than worry about what everyone else has. While many are worrying about the economy on the server I feel like it is fairly balanced. A new player has a pretty decent opportunity for success at steady rate. I have only been here a few month but I feel like me and my base mate are at about middle class. enough diamonds to make trades for things we need/ want but not enough to trade a bunch of diamond blocks.

If the reason for limiting/removing spawners is due to server lag then maybe it is best that the spawners go.
My reason for commenting in the first place was because the more I have been reading this thread the more it seems like people feel like the whole world is going to hell in a hand basket over spawners and that they are jumping to the most extreme of resolutions (server reset) before truly exploring other possibilities. I hope my long response has been helpful and does not just receive a bunch of comments on how long this reply is. if something is not clear or confusing let me know I was about to go to sleep when I saw your reply @CraftyMyner

@Cileklim You could give them a different spawn egg and some craftycoins in return? You can't just remove the whole feature just for a single mistake.

We cannot just take things from people that have brought them with real life money, it makes no sense, will cause huge trouble and mistrust nor do we have a precise list of who owns what eggs.
Tracking down all the OP ones would be a nightmare.
This is not the route we should be taking and I think most players would agree.

@Cileklim Removal of this feature won't fix anything because shulker eggs are still out there; being used, bought, sold...

Wrong it won't fix the current problem of shulkers but it will fix the future issues. We are trying to limit the damage caused by making sure it stays at only shulker eggs causing damage.
Thankfully due to the cheap grinders the price has mostly become cheap and it's not too OP but we cannot rely on that in future cases nor should rare items be cheap and easily available.

@Cileklim Bat spawners can be used for XP purposes so they will cause lag just as much as any other spawner(s).

You are being intellectually dishonest if you claim that a bat spawner is just as likely to be used as a shulker spanwer and therefore will cause similar lag. Its quite clearly not the case.

@Cileklim The problem is not the spawn eggs. It's the shulker egg. I'm afraid the only solution to this problem other than map reset is to remove shulker eggs/spawners and give those players something else in return (different spawn egg, craftycoins, diamond blocks, an item with lore etc.). Removing a feature this vital should not be an option, cons are simply too many. My 0.02$

The problem is with the spawn eggs, since they are unobtainable items that we should not have being putting in spawners in the first place. This was not part of Mojangs intention for the game, since it's quite clearly overpowered even in the case of just cows and sheep. Therefore for the benefit of the server we will stop this service.
It is not a feature, mojang never added this to the game nor is it vital since the vast majority of players do not have access it. So it is indeed an option and clearly the best one.