Well I have never heard THAT before. The problem with trying to make some sort of "hardcore" server would be that nearly every change in the game was made towards being casual. I mean what would you say are the core things of Mou?
Hardcore version of Mou? Take out the equip/card shops, drop rates to 1x base, 10x job. Perhaps reduce some more the drop rate. Done :v
While I do not have concrete proof people are using WPE use things they should not, it is pretty common that I see people bragging in game about being able to equip items they normally should not.
This could be the Sniper Suit issue. For a long time, eA's item_db was messed up and allowed pretty much every class to equip the sniping suit. When this finally got fixed, a LOT of people started to complain and wanted back their bug. However, even though it was fixed, people did not automatically lost their equipment, it was still on until they would take it out (or get stripped).
A few people are paranoic about this, and are careful to only pvp with said chars and have their set be unstrippable to avoid losing them. You could say it has been laziness from my part to not code in something to remove these forbidden equips :< I should add that to my todo list.
Something similar happened years ago when the "new cards" back then were all wrong, but this time I did add some code to automatically disable cards that were not compounded where they belong to (injustice cards compounded in headgears was the example that made me take action

).