Because I want to finish dungeons as fast as possible for my 10% chance at a reward. If people are pulling one mob at a time, I'll politely ask for them to speed pull. If they don't want to, I'll just eat the 30 minute penalty and do other in game stuff in that game until I can try again. No time lost for me since I can do other in game stuff I normally do (maps, marketboard stuff, etc) or do irl stuff in the meantime. No point in arguing and name calling. If we have different play styles I just choose to leave.