People are getting ripped off when it comes to giving/getting bit by a Werewolf or a Vampire. People pay and don't get bit, and people bite and don't get paid. There needs to be a fix that will not compromise the vision of the game, require a lot of programming and makes the players happy. I think I have that solution.
The only change will be the actual bite it self, remove it from the game entirely. Instead; every 7 days the Vampire or Werewolf can choose to generate an "Essence Vampire" or an "Essence of Werewolf". How you go about doing it is open for discussion, but my suggestion is to go to a shrine and perform a minor ritual that will give you the essence. This essence can be traded, sold in guild stores or sent by mail. Once the "uninfected" person has the item in their inventory(Supply slot) they simply use it to start the quest(like a consumable). Everything else stays the same; no changing of the spawn times, no changing of the spawn locations, and no new NPC quest line.
I think this would require very little programming, keeps the vision the programmers had for the quest l line, and keeps people from getting ripped off. Plus, for Vampire or Werewolf guilds this would be an income source for people of all level and keep the pricing at a fair level because of competition in a open market.