If this was for Trademark protection reasons, why did they wait well more than a decade after publishing their first LARP books to do so?
White Wolf has proven itself very litigious in the past. They did sue Sony over Underworld, which was thrown out. They sued the Camarilla and forcibly absorbed it as a house organ, instead of a fan club that operated with WW's blessing. OWBN is likely to be wiped out by this, and as the Cams major competition, that may well be a goal of WW in this. To be honest, what I've heard from OWBN players is that it has a reputation about as bad as the Cam though.
I played in a large vampire larp here in Lexington that lasted for two and a half years, and we got players from around the state and from other larps who came. Of all of them, only two (both Storytellers) had any Camarilla experience, and neither was a current member (hint hint). The organization has a reputation of being munchkins, powergamers, extreme favoritism, and being very poorly organized (it's a very bad sign for what is supposed to be a large organization when I can find little about them on the web, and what I do find are web pages that haven't been updated in literally years). For the record, that larp didn't normally charge, we got the venue from the University (which since many of the players were members of the campus gaming club, wasn't a problem to make a request through them), and the ink & paper costs and other minor operating expenses were just soaked up by the ST's as the cost of gaming (a little like how a tabletop GM doesn't charge his PC's for the new books he buys).
Now, there was one time this larp did charge for an event, they rented the convention facilities of a local hotel and had a whole-weekend event, charging to cover the operating costs of renting the meeting space, since it wasn't cheap, that's it.
For legal reasons, it might, might be a wise idea, from a customer & public relations standpoint, it is an utter disaster.