T-GDI in Ai3

I have a doubt with,"why Hyundai launch a GDI in all model ?". For upcoming Ai3 , also they plan to implement the GDI.GDI is costly for Hyundai customers. Because middle class people are Hyundai's major coustomer. For mostly i10 will be their first car.In my experience they will not ready to buy a GDI. Instead of GDI,turbo is enough to Ai3. For premium model cars GDI is suitable. But not suitable for Ai3 (i10).