I think the motoring press is largley to blame for the lack of popularity in the 924/944/968 range.
They always called them the "poor mans Porsche" - now the 924 was never that good anyway (an odd-an-out Audi) but the 944/968 never got graged on their own merit by the press.
People follwo what "the motoring journos" say - so the 944/968 were doomed from the inception.
Maybe TT can help change the world view of the 944..