What I find silly is that those who wipe the group, or leave before the boss, or vote abandon do not understand one simple thing:

Killing the boss does not save progress. Using the exit portal saves progress.

They can go all the way to floor 50, kill the boss, and if they did not get any upgrades in the run just leave without using the exit portal. Progress wont be saved and they can continue running 41-50 trying to get an upgrade. While those who did get an upgrade can save their progress.