They started a new promotion with the destinations mentioned in #2 and the minimum prices are similar but not exactly the same for each destination (Milan being the cheapest return). I found a couple of return tickets from Frankfurt within the Christmas holiday that would cost ~110€ and bring ~3400 miles (about 4500 miles for the comfort flex ticket but that's 46€ more expensive) with the 2x miles promotion, which expires in 3 minutes, but didn't book...