I never understood why people don't send us an invite when we join their LFG posting. I wait about 5 minutes, then I close my invitation and move on.
Partly because people raid report you and dont bother. Another issue is that the fireteam leader forgets to close the fireteam after picking up the necessary players. For all you know, it could be 3 people making separate posts to find players. Hence why you find yourself hanging sometime. Not everyone is right next to their computers when finding players.