It is extremely popular, it's just regardless of individual states' enforcement and specific requirements, it still remains illegal to tamper with or render these systems inoperable per federal rules and regulations. The federal authorities finally put their money where their mouth is and investigated and prosecuted violators. As a result, these services and products are no longer widely or openly advertised. That's what you're running into.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim