Do you register your displeasure when a restaurant changes the price of a sandwich you like? Perfectly entitled to, but seems a bit extreme to feel the need to tell a company that you dislike the fact they've stopped giving away miles more cheaply than they had intended. In other words, they changed the terms because people were spending $3 and getting miles that cost them far more than that. Perfectly logical for them to change to a $25 minimum to stop that from happening - no? And even if not, it is their prerogative. Take your business elsewhere if you don't like what they offer.