Honestly why do you care what other people do. It doesn't really effect you at all, and you won't ever know if they ran it with 30s or 50s. For example lets use FFXI and I have a Kraken Club I got from BCNM or LoO or bought w/e. How does me having this piece of gear effect anyone that I do not play with in any way?

It doesn't.

It doesn't make me claim Nidhogg better so that you have less claims, it doesn't let me magically find all of the Coffers first. It does not effect anyone I do not play with in any way, shape, or form. So the point of having 50s run through the instance for 30s again, doesn't mean anything to anyone really. Its their choice, respect that.

If you want to do it with 30s, fine; if you want to do it with 50s, also fine. You must also realize this is mid-game content for PS3 goers at some point in the future, where they may group up with each other and do it as intended. They can't just overload L50 content and have nothing to do for the new (hopefully) surge of players PS3 will bring to do while getting there.

Most MMO's I go to do NOT have people powerleveling random groups through instances, and since this also gives SP I assume many people will deny the L50's to get some XP outside of Leves and Behest. I don't think its a problem leaving it uncapped, because again it doesn't effect anyone except those 4 people going.