Originally Posted by Anglo Large Clawed Otter

Because International J fares are CO's bread and butter. CO has to sell its front cabin on BF equipped flights to stay in business. No airline in the world has an EUA system from Y to J for long-haul flights. Such a business model would make for financial ruin. Most customers would have absolutely no incentive to shell out $2,000-$6,000 for a business ticket (waaay more than a domestic F ticket costs, and contributing far more to operating profit) if they could just wait until a few days before the flight and play the EUA lottery. No airline in their right mind would ever adopt such a system.