Pray your miles don't end up in LH M&M, where it will cost you 30k miles for a return trip to Europe, PLUS the same ludicrous YQ charges (which, admittedly, they'll waive for a surcharge of another 15k miles - because they're all heart, really).
I am having a "seriously grumpy at LH" day today. Drinking their free beer and wine in TXL didn't improve my mood at all.