When I join a party I always take a look at the parties gear. In most cases you even see it upon entering that some people are not geared. I'll ask if someone needs gear and if nobody says a word, I'll need/greed for my retainers/seals/alts/glamour etc. However if I find myself wiping 50 times at the first boss because people can't be asked to pay attention for 10 seconds, I'll greed/need anything that shows up on the loot window and get the hell out of that run lol