enigma1 - 8:58 am on Apr 20, 2012 (gmt 0)
It's not matter of implementation it can be implemented, but at what cost for your business?
If you want to buy something you search the net, you find the product you click the link and then maximum focus is given to the price, buy now etc. The likelihood of clicking the buy button right away to add something to the cart is extremely high. But what will happen is, instead of adding something to the cart you will be presented either with a notification to give some cookie consent or a page refresh about cookies aren't set and an option to comply. That's one example.
So maybe 5% of people block js, but 95% of consumers will click the back button in this case and go to another site without even reading the notification because after all that's not why they visited your page plus it looks spamy.