That's just plain breaking or ignorance of the rules. There's very little at all that can be done on anyones end but the players to prevent it. Sure, reports to CC's / DM's might get the rulebreaker punished or something, but the 'IC knowledge' will have spread around all of Barovia by then, and short of repeatedly announcing 'OOC: Nobody is aware MonsterLycan1 is a Werewolf!' every ten minutes until everyone has the message, the damage can't be repaired.
Any step we take, journal entries, rules posts, announcements, etc, it only takes one person to ignore them, and the secret will spread like wildfire. Best thing you can do is not blindly trust anyone who claims someone was a werewolf after a traumatic event that usually leaves people dazed and confused, and wait until you find proof for yourself.
this is why i learned from early on, better to embrace the character, rather then to fight the meta gaming war that you can never win. unfortunately players dont give us long before something is thrown at ya. i think my character lasted a month before he was discovered. and i said screw it, tired of dealing with it. once you embrace it players lose interest in it. give them nothing to meta game and you have Zero Problems with Meta gaming over all.
as far as the throw away MPC's, i think they worked great for the event. but consider it was a controlled environment, and even by late mid week we had players the same level as us (level 5). the plot i ran was very enjoyable to those who were involved i suspect, but i agree that this would just make the role feel trivial if it was put on a consistent basis.
i agree also that the players who just want the instant kill/gloating rights are always going to exist. its a product of having two separate Rules concerning Perma death/closure between the two groups. one group is always going to win, the other is always going to lose. sorta takes the risk out of it entirely.
as far as other MPC's go, i think me and Morticia are really the only daily active ones, i rarely every see them. like jay said the others log on once a week if that it seems. i dont think lowering level cap for Lycan's or any other MPC is really going to help the fact that if someone wants to stomp them put, its not hard to accomplish. their Survivability has always been the issue, and cant really be fixed without a change in the template.
also consider the fact that every MPC race is different, there is no general Stereotypical role for "Horror", or interacting in general as it differs per character and race. Lycans are more prone to the PVP type of horror, gorging and feasting on their victims. sub-dual mode can make that really handy i would imagine.
vampires (and Vampire Spawns) are more interested in power, manipulation, and knowledge (excluding blood of course). they are not consumed by a raging animalistic mindset like Lycans for example. so the confrontation is always going to be different depending who you run into. i was always a fan of the Vampire Mythos/Legends. at the time that i applied i did not know the Vampire Spawn had the highest Survivability rate, there was very Few Vampire MPC's at all, or rather MPC's in general quite frankly.
i think there are a number of players out there that are passionate about the Lycan MPC's, or perhaps a ghoul/wight. but there are allot of factors that deter them from ever applying such as level loss, seeing other MPC's get stomped on by aggressive players, seeing Forum threads complaining about the role etc etc. it all adds stress to your plate, and is probably the main reason your not seeing any new Lycan MPC's.
i honestly think that if your going to apply, apply because:
1.) you love the Lore behind the race, being Passionate about something means your going to pour your heart into it every time and pull 110%.
2.) your OOC Character is of the Mindset of taking pleasure in others enjoyment. because then you wont mind if your character is chased away, repelled, Misted etc etc. so long as it was fun for them, that is reward enough.
id personally like the Were Creatures template revised. maybe giving them Hips and increased stealth or something. and if not that i suppose the throwaway MPC could work, but i agree that there should be two different category's. long term and short term. both types of those MPC's would have their advantages and make up the difference that the opposite lacks.
the attachment comes not in the characters we play, but rather the Role. i love playing the MPC role, i love making stories and scenes rather then being on the receiving end. what bothers me is the length of time it would take to get back into that seat. the Throw away MPC may in fact Cure this. but something like that would take allot of brainstorming to pull off in a accepted manner.