First, I'll address other Mazdaspeed cars:
1. The Miata is a roadster. The market is much smaller for a roadster than it is for a 4- or 5-door.
2. The MS6 suffered from an identity crisis. It wanted to appeal to the younger crowd, but at $30k, it didn't really jive with that crowd's wallet.
Now, why the MS3 will sell:
1. As a 5-door compact, it is more attractive to the masses (particularly people in my demographic) than a 2-door roadster or 4-door family sedan
2. The MZ3 has received great reviews, which will help when marketing the MS3
3. They are going to market the MS3
4. $22,835.
5. Every review/preview of the MS3 published so far has been a ringing endorsement for the car.
6. They are only making 5,000 - this creates a limited market, with no guarantee that there will be a 08 model.
I hope I answered your question, since with your poor grammar and punctuation, it was hard to tell exactly what you were saying/asking.