It's not the worst thing in the world, it's just something that I don't think many cam girls will appreciate, ya know? Some models sell their phone number, some share their address for the purpose of sending them gifts, but most will be very protective of their privacy, because it's often not safe to be any other way. There's also the issue that cam girls are there to provide a fantasy, a fantasy that takes place online, under a stage name, and doesn't extend to the real world. For some members and models, that fantasy gives way to real-world friendships, but that's something that can't really be forced, and that just has to happen organically, and doesn't just happen when you tip a magic number. By straight up asking for things like phone numbers and addresses when you first meet a model (or even if you've known them for a while), even if your intentions are completely innocent, the model is almost certain to be taken aback. "What does he need my number for? What does he need my address for? What is he planning?". If a model enjoys your company enough to want to swap numbers or let you know where she lives, she'll broach the subject with you herself. If not, I think you just kind of have to accept that she only wants to be contacted through the avenues she provides/offers to you when she's on cam.