When will it stop. The trouble is, nowadays, you don't know who any companies share information with. We had a new bedroom fitted last month, and since then I've had calls from carpet companies, curtain companies, and blind companies, all asking how our new bedroom is, and would we like a quote for their products.
My point is, who do the insurance companies/ bike accessory websites/ warranty companies share their information with? And once a bike has been stolen from your home, the thieves know that there's a high probability that there'll be a replacement bike there in a few weeks.
As to securing a bike in your garage with ground anchors/ chains/ alarms, do you really want to come down in the middle of the night and confront a thief, or two, and risk either going too far on them and ending up in prison, or them turning on you, all for a bike? I know I don't.