OK here's what it is - all those other manfacturers didn't stop making good performance cars 15 years ago. Ford did, so people who are into Cossies have no means of moving forward, hence the big scene for these old cars.
If Ford were making cars like that now, the Saph Cossie would be the cheap entry level to Cossie ownership and would be looked down upon by those with the newer models. That's just how it is. Yes Cosworth is special, but the lack of new cars just shows the old ones in a different light.