I'm with you on that. I've been doing around 40-50 miles per week for my marathon training too. Anything more than that and I start to feel like I'm just running for the sake of running. Quality over quantity is key. I've had my fair share of injuries from pushing too hard, so I've learned to listen to my body and take it easy when I need to. Don't think you need to hit 70 miles per week to be a 'eal' marathon runner.