After you do 100 leves, the rewards start to add up. Even if its 'only' 1000 gil, after 100 leves that's 100,000 gil! O.o

Even if its only junky equipment, after 100 leves you would normally have 5-10 'good' pieces that could sell for 20-30k each (another 100-300k o.o!)

Every little helps ^.^