The old forum was totally outdated, it needed a new (and pricey) license, we were forced to move it to a new server where it didn't work which would mean weeks of downtime and development costs. On top of that, we had to pay way more money (monthly!).
I'm really disappointed that after all the work we put on to keep the forum running over the years and all the trouble we had moving to this new place to get this feedback.