Again, simple supply and demand.
If you think the GTI/R isn't worth it then buy something else.
But what will you buy?? Porsche, BMW, Focus ST/RS, Audi, Skoda or Vauxhall?
All new and in demand models are going up at the moment.
I got a good deal on mine but then I ordered shortly after the release date, not sure VW (or dealers) knew how high the demand would be.
Fantastic car and worth every penny/cent to me.