I don't really understand VAGs Motorsport strategy tbh. Sure they can borrow a lot of stuff off Skoda to keep the development costs down, and an R5 programme should be profit making. But on the other hand they will probably damage the sales of Skoda Motorsport (indeed we've already seen that if BRR are moving to the Polo)
Sure they will bring some extra sales to the market from local VW importers e.t.c. but every Polo sale is not going to equal an extra R5 sale.

