For a small group, if everyone is making multiple weapons, (eliminating "change at a pouch you need" factor) then it's much more efficient to kill the boss only and not spend extra time/manpower to full clear. Perhaps not everyone plans to make multiple weapons. I certainly don't have plans for it. However, if I end up getting 30 coins of another type due to personal chests, then I'm certainly going to take the time to camp some NMs and make a bitchin' weapon. One guy in my linkshell has half the coins for a weapon he wasn't main lotting.
Also, with a small group it would take more time, and probably an additional death pull, in order to fully clear the zone. Recently, we noticed that the 2 big leechers were doing their own linkshell events, so we quickly went into the zone in order to capitalize on the opportunity that we wouldn't be bothered. In this sense, we're not going to waste time killing babies and getting fewer chests just to see the small possibility of a single extra coin. Our goal is to kill the bosses asap and get in as many runs as possible before the leechers are done with their events.
You can't say that it's better for all groups to fully clear the zone because, although you believe that it's better for your group to, it's certainly not better for my group to do that.
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