i think the thirsty nature of the turbo means some people are getting rid as they can't justify the fuel, the guy that runs the scooby garage near me is always selling classic turbos, he gets shut of at 2 cars every week and a half, he gets the odd sport in but always scraps them after getting the panels off them or just selling for px prices, the reason theres not many sports about is the boy racers can't afford the turbo but they can have turbo looks for less insurance, they will keep them until they kill them or they can afford the turbo, that's my thoguths
Dogma had a sport and was well chuffed with it, if the gearbox hadn't gone he would have kept it quite a lot longer, he got the awd of the turbo, the noise of the scoob and fuel economy to die for, i think most sport owners will be the same, also you'll get more turbos for sale that have engine issues and the owners is trying to sell without anybody realising and it doesn't cost him the earth