I wonder if the VtM experience was a lot different in the US then it was in Europe in '91.
At the time 1st edition VtM was released, I was 15. I was already well into gaming, D&D, WFB/40k, Shadowrun, Battletech, board games, etc. While very cool, there just wasn't room in my budget for another game line at the time. There was an older friend who bought just about anything WW at the time, so I read quite a bit from their collection. I also played WtM for the first time in a group with them. At the time I was either playing games with boys my own age (no girls), or I played in an older crowd where I was the youngest and some older women (compared to me), whom already were into gaming (as far as I could tell), did play. I never experienced directly the influx of female players by VtM. But you also have to realize, that VtM was an English publication, there might have been French or German translations, but no Dutch ones. So their sales/exposure was limited to either a very limited amount of game stores or a few English book stores, mostly concentrated in the big cities. The amount of female goths and metal heads I encountered was also very limited (neighborhoods/schools).
I do think that you need to separate the pnp RPG crowd and the LARP crowd, while there was some overlap, and people of one group often tried the other's activities, in the end LARPers tended to like LARPing, and pnp RPGers tended to like pnp RPGs.
In the mid '90s, after having played some VtM, Mage, and loving the Werewolf books I started to buy into them. Eventually as a group we started playing both Shadowrun and VtM, as a break from D&D, we did eventually return to D&D (and we still do). I am tempted to play a game of VtM again, but wonder if I would run W20 or VtM5e...
What WW did very well, even better then Shadowrun, was the meta story. A lot of book buyers didn't ever play the game or enough to warrant the amount of money they spent, they just read the stories, the background, and theorized a LOT!
I also remember Jihad/Vampire the Eternal Struggle (cardgame) also came out in '94, which was a great game and probably drew in more VtM via cardgaming (first MtG, then VtM)...