Ill reiterate one more time to try some of the maps you get. The pieste map "recommends" a group of 8 level 50s, but 2-4 coordinated people can manage(less required the better geared and higher level they are). You could get up to 30k gil for opening the thing, plus mats/minis that sell for several times that(or potentially less then this, as theres a good amount of randomness to maps). If you and your friends each bring a map(or two - you can have one in your saddlebag that doesnt count against the 1 in your inventory limit) and you take turns, you can each wind up with a potentially good payday. That gets accelerated with the level 60 and 70 group maps(with their random mini-dungeons), but it starts at 50.