Vauxhall did this to capture the blingers market. I remarked on it in my test of a Vectra in 1994 here: www.honestjohn.co.uk/road-tests/vauxhall/vauxhall-.../ I think that tyre makers supply this type of tyre at attractively low rates to carmakers because they know they will rake in the money on replacements. The most sensible thing to do is switch to standard 16" wheels with something like 55 profile tyres that give the same rolling circumference. There will always be a blinger somewhere who will buy your 19” wheels and tyres on eBay.