It's just not a Main Stream Marque, and Ford, VW, and the like have a huge advertising budget, you only have to look to how many units they shift compared to Alfa, and no matter how good Alfa are or become they will never match the sales of there competitors, oh....... and the fact Alfa's build quality tends to let them down a bit !!! Alfa owners will always be a minority and for me that's a plus.
I think Alfa just demonstrated how to get everything wrong with the launch of this car.
I think its important that when you launch a car it has an initial sales surge so that they get seen on the road and people, who may not be up to speed on new models etc, want one - as its different and just out.
However, IIRC (and it is a few years ago) they times the launch in this country so you couldn't order one and get it delivered for the new plate change.
They also alienated a lot of previous Alfa customers by significantly 'upping' the price - compared to the outgoing 156 - including starting charging for Alfa Red as a 'special paint'.
Additionally, when it came out it was one of the 1st of new launches - and had been designed to meet new NCAP requirements - which made it significantly heavier than other cars at that time (although it's also fair to say that subsequent models from other manufacturers also increased weight).
I think all this resulted in a damp squib of a launch - which it never has really recovered from.