It really does depend the routes you fly and when you are in the air. I was doing lots of Monday morning to Thursday evening hub to hub domestic travel. In my experience those are the toughest routes and times and you really have to be purchasing H or higher to have a shot as a 1K. If you fly a few hours later on a Monday or leave earlier on a Thursday your rates will improve drastically. AA and Delta don't prioritize lower elites on higher fares over higher elites like UA does.