The Economist offers 10,000 Miles & More (Lufthansa Group) Bonus miles when you subscribe to The Economist Digital and Print Edition.
The subscription will cost you US$160. The Economist is one of the few magazines I'm ready to pay for every week. In fact I already have a subscription for the magazine right now.
Even if you are just ready to 'pay' $60 per year for the magazine you will 'buy miles' at 1 cent per mile. This is a good offer if you have a specific Lufthansa redemption in mind.