I asked myself the same question a few months back, don't seem to see many "older" evos and scoobies on the road, maybe because the early ones had to be imported
Seems most evos on the road are 8 or 9's and scoobies are 2/3/4 yrs old at the most (well, in my neck of the woods anyway).
In some respect, Ford not releasing a new model every other year probably has done the RS scene a lot of good

, think about all those people who bought an evo/scoob only to find a newer (better ?) model appear two years later, makes you want to upgrade, etc... which makes the other cars loose value and interest.
My tuppence.