Let's leave it at every class is as expensive as you want it to be. This a bunch of useless discussion bc some people are comparing 2s all gear with 1s gear set. ITS OBVIOUS THAT ANY BUILD WITH 2S GEAR IS GONNA BE ULTRA EXPENSIVE. So expensive to the point that it is impossible to compare and contrast with other classes due to either non existence or fluctuating markets.
Im pretty sure that samu or claw monk class are the most expensive. For samurai,gear and xtal is about 3b+,ai about 500m,u also need auto abi which is 500m for lv4 and 300m ish for lv4,also dai with ele xtal or hcb with ele xtal,thats is how much it cost for a(geared)samu,not including a 2s muramasa or a 2s izu,or 2s legacy if will(how much would it be?40-60b++++) Also same for claw monk,monk have same arm and add add as samu,auto 5 and 4 abi also,hcb with ele xtal,dai with ele xtal,also elemental claw 2s,testa 2s,d.claw 2s,CEDURO 2S!(just from 2s claw idk how much it would cost but.......maybe 50b from just all of those 2s claw.