Do you mind sharing with us an average fare one way from Europe to Vietnam?
I'll give you a hint, it's not great.
First of all I never said that Vietnam flights are potentially huge money makers or will have high yields. What I said was that last time LOT tried the route it was operated by an old inefficient 767 with a dated product along with a much smaller European network for connecting passengers. Now LOT has a substantial network from which it can feed its flights, provides a decent product on very efficient planes and business ties between Vietnam and Poland have become stronger. Furthermore, LOT often charges more for its flights than competing airlines and still manages to fill its planes out of WAW so who are you to tell us they can't make money on it?