It costs 400,000 gil just for your relic for one class. That's 4,000,000 gil for all 10 classes released so far and it will jump to 5.2 million if you have to do all this crap for the three new classes as well. And that's just for the vendor stuff, it doesn't include the market board 3* items you need to buy. I can imagine they might be getting some business especially from people who are crazy enough to pursue the relic on multiple jobs.