Well, i presonaly use 5 wiz/bards 37lvl and i solo them at Hyaunug Ghost Soldiers (something like that) and, gold drop is not that much good but come on, they're still low lvl but items are good, i smiply set them to store every item and after 2-3 days, i come with my main, pick all items from them and make elements (its good cuz i get alot of wind/water lvl3) and many SoXes can be obtained there. Also, at 24lvl mobs, they dont have to use skills so they're using normal attack and 1hit them (automatic im saving money on potions)
Personaly, wiz/bard > the best solo goldbot build