Is buying LM miles still worth it ?
Even under the curent promo 135 % bonus, one can buy 100k for 1404 US$/1258EUR/928GBP
For a direct flight from Europe expl. (FRA-BKK-FRA) you need to pay 2426US$ / 2173EU / 1604 GBP in business or 3100 US$ / 2777EUR / 2050GBP in first class. icl. all taxes/fees.
I think, specially in business, one already get cheaper revenue tix, which aditionaly earn milage and status.