I worked on a personalisation system that affected the sort order of products returned from a search so as to place the products in order of the customer's propensity to buy.
After the initial excitement had worn off we found that the identified preference became stronger and stronger. Not because the customer's ACTUAL preference was any stronger but because they were only seeing products based on past preferences (unless they started paginating through results which is something very few customers did).
...
When online shopping, I typically just enter a couple of keywords and then immediately sort the returned search results by price from lowest to highest.
:satisfied:
"Do not seek to follow in the footsteps of the wise. Instead, seek what they sought." - Matsuo Basho