I think I am the ultimate valueless customer for Delta. I am PM also, and I live in Europe, so I don't need any MQDs. I reached PM just by flying many EU-US flights, mostly on AF/KL. Yeah, I flew all together 3 segments on Delta last year (didn't get upgraded), earning 83.000 MQM. And I spent about 3000$ on tickets (incl. taxes). If I were crediting these miles to Flying Blue, I would have not even earned SkyTeam Elite Plus.