I'll be strongly against it if it was not anonymized. Ive always believed measuring things is the starting point of making them better but Im afraid of the idea though. The marketeers already make an almost too efficient use of all the scientific development in economics and psychology. I wonder how they'll abuse all this open data while the other side, the consumers or the majority of them atleast seems too disorganized and uncaring to take any effective action using the same data.