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There is definitely a market for BBWs. As with any escort,  focus on highlighting your honest strengths, attractive features and skills and don't charge above (or that much above) the other providers offering similar things in your area, unless you only wish to be low volume. And even then its still worth staying in range. As well as local and generic advertising try looking into BBW directories. 

The best thing I can say about security on cam is, I know women who wear wigs  that are very different to their natural hair, make up very different to their day make up, or even wear masquerade masks. However cam is never going to be all that discreet in honesty, by its very nature.

As for security if you work from home...don't give out a postcode or street name to guys who book. When they book give them a landmark near that they can call you from and then direct them on the phone once they arrive. If they book in advance tell them to call an hour or so before to confirm and only then give the landmark, obviously in the initial comms you'll need to give them a general area so they can work out travel time, but essentially you want to minimize 'timewasters' (who could be anything from annoying, but ultimately benign fantasists, to local pimps or stalkers, although I think the former are thankfully more common) from having your exact location details.

In my experience most nefarious shit heads are not slick Ted Bundy types, and give themselves and their propensity for tomfoolery away on the phone, by which I mean, if they sound weird, reticent, mumbley or like a general jerk, there is a reasonable chance they are a git who will mess you around. Most reasonable clients will have the basic social skills to book an appointment with an escort with courtesy and clarity. Basically, go with your basic instinct, if they sound 'off' at all, don't book them in. Of course that means some genuinely shy guys will be filtered out... but you have to take care of you in this game.