I was part of a club who won HF NFD five times in a row. We went from a multi-op open staion to having entries in the restricted and QRP sections as well. The work involved in getting it all together was immense. It got too competitive and stopped being fun so I stopped.
Now, after a bit of break from ham radio, my interest in the hobby has been rekindled. Would I contest again? Yes, but it would either be solo or part of a small group and just for fun.
We did have one memorable entry in CQ WW. In the U.K. we knew we were running out of G calls. So we made an attempt to get the first M call. I became the holder of M0AAA. We picked up the new licence at a special presentation the day before the event.
I couldn't believe the pile up we attracted! Most of the world had not heard of the new prefix and thought it something.
Imagine their disapointment when they found we were in a field in the south of England