I don't see players getting together as a bad thing either, i just meant that the suggested solution was not something i agreed with.
The biggest problem at the moment is that no one dares to do the first strike. When i see that any boss is up i will try to help the best i can, and i hope i get help with the ones i do too (and thankfully i count 3-4 paying users as my friends so i guess that helps me take them down a fair deal). But for most players, they do not dare to make that first hit, which means the boss will just be there and eventually flee.
As you say, the rewards are not that great and on the other hand focus is also precious to many players and they do not want to waste it on something that probably is not going to die. They see a boss with "omg 4m health left" and think "i better wait til it is lower" or "i'll just throw in a weak attack and pray it goes down." I don't think removing rewards for helping lower level players is going to help removing that fear. Maybe it will, since there would be nothing else to use it on, but what do i know.
In the end, it feels like it's a huge mess from DMM/nutakus end to make the bosses this difficult. Lower SED players will feel discouraged in general since they will eventually hit that wall while they struggle to find any high SED players to help them with them because the high SED players also want more high SED friends.